Difference between revisions of "Knoop hardness scale"
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== Description == | == Description == | ||
| − | A hardness scale based on measuring indentations that was developed in 1939 by F. Knoop, a 20th century chemist. The Knoop hardness scale ranges from [ | + | A hardness scale based on measuring indentations that was developed in 1939 by F. Knoop, a 20th century chemist. The Knoop hardness scale ranges from [[glass]] (300-600) to [[diamond]] (6000-6500). A Knoop hardness tester drops a pointed diamond indenter onto a material then examines the size and depth of the indentation to determine surface hardness. This test is generally used on brittle materials like [[ceramic|ceramics]]. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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Knoop-Härte (Deut.) | Knoop-Härte (Deut.) | ||
| − | == | + | ==Resources and Citations== |
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 | ||
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* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | ||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: Knoop Hardness." | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: Knoop Hardness." Accessed 8 Sept. 2004. |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 08:10, 23 September 2022
Description
A hardness scale based on measuring indentations that was developed in 1939 by F. Knoop, a 20th century chemist. The Knoop hardness scale ranges from Glass (300-600) to Diamond (6000-6500). A Knoop hardness tester drops a pointed diamond indenter onto a material then examines the size and depth of the indentation to determine surface hardness. This test is generally used on brittle materials like ceramics.
Synonyms and Related Terms
Knoop-Härte (Deut.)
Resources and Citations
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Encyclopedia Britannica, http://www.britannica.com Comment: Knoop Hardness." Accessed 8 Sept. 2004.