| dbo:abstract |
Scratch hardness refers to the hardness of a material in terms of resistance to scratches and abrasion by a harder material forcefully drawn over its surface. Scratch hardness test or scratch test refers to any of a number of methods of measuring scratch hardness. Resistance to abrasion is less affected by surface variations than indentation methods. Scratch hardness is measured with a sclerometer. Attempting to scratch a surface to test a material is a very old technique. The first scientific attempt to quantify materials by scratch tests was by mineralogist Friedrich Mohs in 1820 (see Mohs scale). The Mohs scale is based on relative scratch hardness of different materials; with talc assigned a value of 1 and diamond assigned a value of 10. Mohs's scale had two limitations: it was not linear, and most modern abrasives fall between 9 and 10.; so, later scientists attempted to increase resolution at the harder end of the scale. Raymond R. Ridgway, a research engineer at the Norton Company, modified the Mohs scale by giving garnet a hardness of 10 and diamond a hardness of 15. Charles E. Wooddell, working at the , extended the scale further by using resistance to abrasion, and extrapolating the scale based on seven for quartz and nine for corundum, resulting in a value of 42.4 for South American brown diamond bort. There is a linear relationship between cohesive energy density (lattice energy per volume) and Wooddell wear resistance, occurring between corundum (H=9) and diamond (H=42.5). (en) 刻（kè）划（huá）硬度在矿物学里一般指物质刺入另外一种较软物质的能力。一个由硬物质构成的物体能在另一个由较软物质构成的物体上形成划痕。刻划硬度常以摩氏矿物硬度单位计算。一种最常见的测量工具叫做。 (zh) |
| dbo:wikiPageID |
22670227 (xsd:integer) |
| dbo:wikiPageLength |
6392 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID |
1115598293 (xsd:integer) |
| dbo:wikiPageWikiLink |
dbr:Quartz dbr:Bort dbr:Indentation_hardness dbr:Corundum dbr:Friedrich_Mohs dbc:Hardness_tests dbr:Hardness dbr:Talc dbr:Scratch_test_(disambiguation) dbr:Sclerometer dbr:Norton_Company dbr:Mohs_scale dbr:Carborundum_Company |
| dbp:wikiPageUsesTemplate |
dbt:Reflist dbt:Short_description dbt:Materials-sci-stub |
| dct:subject |
dbc:Hardness_tests |
| rdf:type |
yago:Abstraction100002137 yago:Cognition100023271 yago:Experiment105798043 yago:HigherCognitiveProcess105770664 yago:Inquiry105797597 yago:ProblemSolving105796750 yago:Process105701363 yago:PsychologicalFeature100023100 yago:WikicatHardnessTests yago:Thinking105770926 yago:Trial105799212 |
| rdfs:comment |
刻（kè）划（huá）硬度在矿物学里一般指物质刺入另外一种较软物质的能力。一个由硬物质构成的物体能在另一个由较软物质构成的物体上形成划痕。刻划硬度常以摩氏矿物硬度单位计算。一种最常见的测量工具叫做。 (zh) Scratch hardness refers to the hardness of a material in terms of resistance to scratches and abrasion by a harder material forcefully drawn over its surface. Scratch hardness test or scratch test refers to any of a number of methods of measuring scratch hardness. Resistance to abrasion is less affected by surface variations than indentation methods. Scratch hardness is measured with a sclerometer. There is a linear relationship between cohesive energy density (lattice energy per volume) and Wooddell wear resistance, occurring between corundum (H=9) and diamond (H=42.5). (en) |
| rdfs:label |
Scratch hardness (en) 刻划硬度 (zh) |
| owl:sameAs |
freebase:Scratch hardness wikidata:Scratch hardness http://my.dbpedia.org/resource/ခြစ်ရာ_မာဆင့် dbpedia-zh:Scratch hardness https://global.dbpedia.org/id/fgk1 yago-res:Scratch hardness |
| prov:wasDerivedFrom |
wikipedia-en:Scratch_hardness?oldid=1115598293&ns=0 |
| foaf:isPrimaryTopicOf |
wikipedia-en:Scratch_hardness |
| is dbo:wikiPageWikiLink of |
dbr:Calcite dbr:Quartz dbr:List_of_diamonds dbr:Mohs_scale_of_mineral_hardness dbr:Hardness_scales dbr:Priestly_breastplate dbr:Anti-scratch_coating dbr:Chinese_jade dbr:Al-Biruni dbr:Fluorite dbr:Gypsum dbr:Hardness dbr:Talc dbr:Chinese_culture dbr:Diamond dbr:Scratch_test_(disambiguation) dbr:Mangalloy dbr:Nanoindenter dbr:Sclerometer |
| is foaf:primaryTopic of |
wikipedia-en:Scratch_hardness |