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 indentor 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 == | ||
Revision as of 09:55, 21 January 2014
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 indentor 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.)
Authority
- 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." Encyclopædia Britannica. 8 Sept. 2004 .