Joanna Wachowicz - Academia.edu (original) (raw)
Papers by Joanna Wachowicz
Archives of Metallurgy and Materials, Jul 24, 2023
Wood Material Science and Engineering, Mar 21, 2023
Wood Material Science & Engineering
Materialy Ceramiczne Ceramic Materials, 2014
Du a twardo w glikow spiekanych oraz zwi zana z ni wysoka odporno na zu ycie cierne sprawiaj , e ... more Du a twardo w glikow spiekanych oraz zwi zana z ni wysoka odporno na zu ycie cierne sprawiaj , e s one cenionym materia em konstrukcyjnym i narz dziowym, co powoduje, e znajduj szerokie zastosowanie w produkcji narz dzi skrawaj cych. Dynamiczny wzrost wytwarzania w glika wolframu od pocz tku wprowadzenia go na rynek [1] spowodowa , e narz dzia wykonane z materia u kompozytowego w glik wolframu-kobalt stanowi ponad 50% ogo u narz dzi skrawaj cych. Jednak ostatnio coraz cz ciej w glikowe narz dzia zast powane s narz dziami ze spiekanego, polikrystalicznego diamentu (PCD – ang. polycrystalline diamond) ze wzgl du na ich wielokrotnie wi ksz odporno na zu ycie cierne w stosunku do w glikow spiekanych [2-3]. Jednak cena narz dzi z PCD jest oko o dziesi razy wy sza od ceny w glikow spiekanych. Wynika to g ownie z wysokich kosztow spiekania diamentu. Autorzy prac [4-5] zaproponowali nowy materia kompozytowy z o ony z WCCo i diamentu, ktory mog by znale zastosowanie na ostrza skrawaj ce materia ow drewnoTrwa o ostrzy skrawaj cych z kompozytow diament/WCCo w obrobce skrawaniem p yty MDF
Materials, Mar 19, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials
This paper reviews the production of sinters using the spark plasma sintering method. SPS (spark ... more This paper reviews the production of sinters using the spark plasma sintering method. SPS (spark plasma sintering) technology has been used for several decades, mainly in laboratories, to consolidate a huge number of both new and traditional materials. However, it is now more often introduced into practical industrial use, with equipment as early as the fifth generation capable of producing larger-size components at competitive costs. Although the mechanism of sintering with the use of this method is not yet understood, the effectiveness of the SPS process for the rapid and efficient consolidation of a wide range of materials with novel micro-structures remains indisputable. With a relatively wide variation in chemical composition, the structure allows the selection of appropriate consolidation parameters for these materials. The influence on the values of apparent density and mechanical properties depends on the parameters of the spark plasma sintering process. In order to achieve ...
Materials
Commonly used tool materials for machining wood-based materials are WC-Co carbides. Although they... more Commonly used tool materials for machining wood-based materials are WC-Co carbides. Although they have been known for a long time, there is still much development in the field of sintered tool materials, especially WC-Co carbides and superhard materials. The use of new manufacturing methods (such as FAST—field-assisted sintering technology), which use pulses of electric current for heating, can improve the properties of the materials used for cutting tools, thereby increasing the cost-effectiveness of machining. The ability to increase tool life without the downtime associated with tool wear allows significant cost savings, particularly in mass production. This paper presents the results of a study of the effect of grain size and cobalt content of carbide tool sinters on the tribological properties of the materials studied. The powders used for consolidation were characterised by irregular shape and formed agglomerates of different sizes. Tribological tests were carried out using th...
Materials
This article presents the microstructure, hardness, fracture toughness coefficient KIC and phase ... more This article presents the microstructure, hardness, fracture toughness coefficient KIC and phase composition of submicron WC-4Co carbides. The carbides were sintered using the innovative U-FAST (Upgraded Field Assisted Sintering Technology) method, from mixtures of WC-Co powders with an average WC grain size of 0.4 µm and 0.8 µm. The obtained sinters were characterized by a relative density above 99% of the theoretical density. The hardness of the obtained composites was above 2000 HV30, while the KIC coefficient was about 8 MPa m1/2.
Materiały Ceramiczne /Ceramic Materials/, Oct 5, 2019
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Spieki metaliczno-diamentowe znajduj szerokie zastosowanie w obrobce betonu, marmuru, granitu i i... more Spieki metaliczno-diamentowe znajduj szerokie zastosowanie w obrobce betonu, marmuru, granitu i innych materia ow budowlanych. Swoje zastosowania zawdzi czaj bardzo dobrym w a ciwo ciom skrawnym, wysokiej odporno ci na zu ycie, wysokiej twardo ci i wytrzyma o ci. Wi kszo producentow spiekow metaliczno-diamentowych stosuje jako osnow g ownie kobalt z dodatkiem takich pierwiastkow jak elazo, mied , cyna, wolfram czy nikiel [1, 2]. Jednak istotn wad faz wi cych na bazie kobaltu jest to, e kobalt wywo uje alergie oraz niektore rodzaje nowotworow. Mi dzynarodowa Agencja Bada nad Rakiem zliczya kobalt do czynnikow rakotworczych. Z tych te wzgl dow zalecane jest zast powanie kobaltu innymi, nie szkodliwymi dla zdrowia metalami. Materia ami, ktore mog zast pi osnow z o on z kobaltu lub stopow niskotopliwych zawieraj cych kobalt s Kompozyty na osnowie faz mi dzymetalicznych z uk adu Ni-Al wytwarzane metod PPS z udzia em reakcji SHS
Materials
The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the ... more The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the microstructure, density and hardness of WC-Co/diamond composites. The obtained materials contained 30% vol. diamond. The advanced sintering method Pulse Plasma Sintering (PPS) was used for the production of composites. The sintering process was carried out in two stages at a pressure of 50 and 100 MPa and a temperature of 1050 °C. Depending on the size of the diamond particles, composites with a density of 91–99% were obtained. Microstructure studies were performed employing scanning electron microscopy, along with an analysis of the chemical composition in micro-areas. Additionally, the phase composition was investigated by means of X-ray diffraction. In addition, hardness tests were performed. It was found that the size of the diamond particles significantly influenced the microstructure of the tested materials, as well as the density and hardness. As a result of PPS sintering of compo...
Materials
The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the ... more The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the microstructure, density and hardness of WC-Co/diamond composites. The obtained materials contained 30% vol. diamond. The advanced sintering method Pulse Plasma Sintering (PPS) was used for the production of composites. The sintering process was carried out in two stages at a pressure of 50 and 100 MPa and a temperature of 1050 °C. Depending on the size of the diamond particles, composites with a density of 91–99% were obtained. Microstructure studies were performed employing scanning electron microscopy, along with an analysis of the chemical composition in micro-areas. Additionally, the phase composition was investigated by means of X-ray diffraction. In addition, hardness tests were performed. It was found that the size of the diamond particles significantly influenced the microstructure of the tested materials, as well as the density and hardness. As a result of PPS sintering of compo...
Materials, 2021
WC-Co (tungsten carbide-cobalt) composites are widely used in industry, wear-resistant parts, and... more WC-Co (tungsten carbide-cobalt) composites are widely used in industry, wear-resistant parts, and cutting tools. As successful tool materials, WC-Co carbides are widely applied in metal cutting, wear applications, chipless forming, stoneworking, wood, and plastic working. These materials are exposed to severe solid particle erosion by sand particles, such as in the wood industry. During the production of furniture with HDF (High Density Fibreboard), MDF (Medium Density Fibreboard), or OSB (Oriented Strand Board), there are observed problems with tool erosion. Contamination, mainly of the HDF by sand, is quite often, which is why all tools used for the machining of such materials are exposed to erosion by sand particles. Although many studies have been performed on the erosion of various metals, and erosion models exist to predict their erosion behavior, the issue is still relevant. The aim of the study was to determine the effect of grain size (submicron, ultrafine) and the manufact...
Annals of WULS, Forestry and Wood Technology, 2021
Functional properties of WCCo composites obtained by the SPS – Spark Plasma Sintering method. The... more Functional properties of WCCo composites obtained by the SPS – Spark Plasma Sintering method. The rapid development of the furniture market results in the need to produce tools with increasingly better properties which make it possible to increase the efficiency of the production. One of the prospective paths of development for blades intended for cutting wood-based materials are carbides made using the Spark Plasma Sintering method. It makes it possible to produce sinters with submicron or even nanometric WC grain size in a very short time and without the need for using inhibitors. As a result of the specific heating conditions, this method makes it possible to obtain a material having high parameters in comparison with the material produced using conventional methods. This study aimed to determine the degree of wear of SPS tools compared to commercially available blades (of similar chemical composition). The results of research testing the basic properties (hardness, density, micr...
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2018
Archives of Metallurgy and Materials, Jul 24, 2023
Wood Material Science and Engineering, Mar 21, 2023
Wood Material Science & Engineering
Materialy Ceramiczne Ceramic Materials, 2014
Du a twardo w glikow spiekanych oraz zwi zana z ni wysoka odporno na zu ycie cierne sprawiaj , e ... more Du a twardo w glikow spiekanych oraz zwi zana z ni wysoka odporno na zu ycie cierne sprawiaj , e s one cenionym materia em konstrukcyjnym i narz dziowym, co powoduje, e znajduj szerokie zastosowanie w produkcji narz dzi skrawaj cych. Dynamiczny wzrost wytwarzania w glika wolframu od pocz tku wprowadzenia go na rynek [1] spowodowa , e narz dzia wykonane z materia u kompozytowego w glik wolframu-kobalt stanowi ponad 50% ogo u narz dzi skrawaj cych. Jednak ostatnio coraz cz ciej w glikowe narz dzia zast powane s narz dziami ze spiekanego, polikrystalicznego diamentu (PCD – ang. polycrystalline diamond) ze wzgl du na ich wielokrotnie wi ksz odporno na zu ycie cierne w stosunku do w glikow spiekanych [2-3]. Jednak cena narz dzi z PCD jest oko o dziesi razy wy sza od ceny w glikow spiekanych. Wynika to g ownie z wysokich kosztow spiekania diamentu. Autorzy prac [4-5] zaproponowali nowy materia kompozytowy z o ony z WCCo i diamentu, ktory mog by znale zastosowanie na ostrza skrawaj ce materia ow drewnoTrwa o ostrzy skrawaj cych z kompozytow diament/WCCo w obrobce skrawaniem p yty MDF
Materials, Mar 19, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials
This paper reviews the production of sinters using the spark plasma sintering method. SPS (spark ... more This paper reviews the production of sinters using the spark plasma sintering method. SPS (spark plasma sintering) technology has been used for several decades, mainly in laboratories, to consolidate a huge number of both new and traditional materials. However, it is now more often introduced into practical industrial use, with equipment as early as the fifth generation capable of producing larger-size components at competitive costs. Although the mechanism of sintering with the use of this method is not yet understood, the effectiveness of the SPS process for the rapid and efficient consolidation of a wide range of materials with novel micro-structures remains indisputable. With a relatively wide variation in chemical composition, the structure allows the selection of appropriate consolidation parameters for these materials. The influence on the values of apparent density and mechanical properties depends on the parameters of the spark plasma sintering process. In order to achieve ...
Materials
Commonly used tool materials for machining wood-based materials are WC-Co carbides. Although they... more Commonly used tool materials for machining wood-based materials are WC-Co carbides. Although they have been known for a long time, there is still much development in the field of sintered tool materials, especially WC-Co carbides and superhard materials. The use of new manufacturing methods (such as FAST—field-assisted sintering technology), which use pulses of electric current for heating, can improve the properties of the materials used for cutting tools, thereby increasing the cost-effectiveness of machining. The ability to increase tool life without the downtime associated with tool wear allows significant cost savings, particularly in mass production. This paper presents the results of a study of the effect of grain size and cobalt content of carbide tool sinters on the tribological properties of the materials studied. The powders used for consolidation were characterised by irregular shape and formed agglomerates of different sizes. Tribological tests were carried out using th...
Materials
This article presents the microstructure, hardness, fracture toughness coefficient KIC and phase ... more This article presents the microstructure, hardness, fracture toughness coefficient KIC and phase composition of submicron WC-4Co carbides. The carbides were sintered using the innovative U-FAST (Upgraded Field Assisted Sintering Technology) method, from mixtures of WC-Co powders with an average WC grain size of 0.4 µm and 0.8 µm. The obtained sinters were characterized by a relative density above 99% of the theoretical density. The hardness of the obtained composites was above 2000 HV30, while the KIC coefficient was about 8 MPa m1/2.
Materiały Ceramiczne /Ceramic Materials/, Oct 5, 2019
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Materialy Ceramiczne Ceramic Materials, 2012
Spieki metaliczno-diamentowe znajduj szerokie zastosowanie w obrobce betonu, marmuru, granitu i i... more Spieki metaliczno-diamentowe znajduj szerokie zastosowanie w obrobce betonu, marmuru, granitu i innych materia ow budowlanych. Swoje zastosowania zawdzi czaj bardzo dobrym w a ciwo ciom skrawnym, wysokiej odporno ci na zu ycie, wysokiej twardo ci i wytrzyma o ci. Wi kszo producentow spiekow metaliczno-diamentowych stosuje jako osnow g ownie kobalt z dodatkiem takich pierwiastkow jak elazo, mied , cyna, wolfram czy nikiel [1, 2]. Jednak istotn wad faz wi cych na bazie kobaltu jest to, e kobalt wywo uje alergie oraz niektore rodzaje nowotworow. Mi dzynarodowa Agencja Bada nad Rakiem zliczya kobalt do czynnikow rakotworczych. Z tych te wzgl dow zalecane jest zast powanie kobaltu innymi, nie szkodliwymi dla zdrowia metalami. Materia ami, ktore mog zast pi osnow z o on z kobaltu lub stopow niskotopliwych zawieraj cych kobalt s Kompozyty na osnowie faz mi dzymetalicznych z uk adu Ni-Al wytwarzane metod PPS z udzia em reakcji SHS
Materials
The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the ... more The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the microstructure, density and hardness of WC-Co/diamond composites. The obtained materials contained 30% vol. diamond. The advanced sintering method Pulse Plasma Sintering (PPS) was used for the production of composites. The sintering process was carried out in two stages at a pressure of 50 and 100 MPa and a temperature of 1050 °C. Depending on the size of the diamond particles, composites with a density of 91–99% were obtained. Microstructure studies were performed employing scanning electron microscopy, along with an analysis of the chemical composition in micro-areas. Additionally, the phase composition was investigated by means of X-ray diffraction. In addition, hardness tests were performed. It was found that the size of the diamond particles significantly influenced the microstructure of the tested materials, as well as the density and hardness. As a result of PPS sintering of compo...
Materials
The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the ... more The paper presents the effect of diamond particle size (varying between 2.5 µm and 20 µm) on the microstructure, density and hardness of WC-Co/diamond composites. The obtained materials contained 30% vol. diamond. The advanced sintering method Pulse Plasma Sintering (PPS) was used for the production of composites. The sintering process was carried out in two stages at a pressure of 50 and 100 MPa and a temperature of 1050 °C. Depending on the size of the diamond particles, composites with a density of 91–99% were obtained. Microstructure studies were performed employing scanning electron microscopy, along with an analysis of the chemical composition in micro-areas. Additionally, the phase composition was investigated by means of X-ray diffraction. In addition, hardness tests were performed. It was found that the size of the diamond particles significantly influenced the microstructure of the tested materials, as well as the density and hardness. As a result of PPS sintering of compo...
Materials, 2021
WC-Co (tungsten carbide-cobalt) composites are widely used in industry, wear-resistant parts, and... more WC-Co (tungsten carbide-cobalt) composites are widely used in industry, wear-resistant parts, and cutting tools. As successful tool materials, WC-Co carbides are widely applied in metal cutting, wear applications, chipless forming, stoneworking, wood, and plastic working. These materials are exposed to severe solid particle erosion by sand particles, such as in the wood industry. During the production of furniture with HDF (High Density Fibreboard), MDF (Medium Density Fibreboard), or OSB (Oriented Strand Board), there are observed problems with tool erosion. Contamination, mainly of the HDF by sand, is quite often, which is why all tools used for the machining of such materials are exposed to erosion by sand particles. Although many studies have been performed on the erosion of various metals, and erosion models exist to predict their erosion behavior, the issue is still relevant. The aim of the study was to determine the effect of grain size (submicron, ultrafine) and the manufact...
Annals of WULS, Forestry and Wood Technology, 2021
Functional properties of WCCo composites obtained by the SPS – Spark Plasma Sintering method. The... more Functional properties of WCCo composites obtained by the SPS – Spark Plasma Sintering method. The rapid development of the furniture market results in the need to produce tools with increasingly better properties which make it possible to increase the efficiency of the production. One of the prospective paths of development for blades intended for cutting wood-based materials are carbides made using the Spark Plasma Sintering method. It makes it possible to produce sinters with submicron or even nanometric WC grain size in a very short time and without the need for using inhibitors. As a result of the specific heating conditions, this method makes it possible to obtain a material having high parameters in comparison with the material produced using conventional methods. This study aimed to determine the degree of wear of SPS tools compared to commercially available blades (of similar chemical composition). The results of research testing the basic properties (hardness, density, micr...
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2018