Gee, M G; Gant, A; Van der Berg, L (1999) Fine scale abrasion testing of hardmetals and ceramics. NPL Report. CMMT(A)175

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Abstract

This report describes the results of tests performed on a range of hardmetals and ceramics using tests which are relevant to the abrasion of these hard wear resistant materials by fine abrasives.
The three techniques that were examined are:
- High load single pass scratch testing
- Low load single and multiple pass scratch testing
- Ball cratering
The scratch tests provide a method of examining the response of the test materials to the model abrasion provided by a test indenter under carefully controlled conditions. In the case of the single pass high load tests this is relevant to severe abrasion from highly loaded abrasive particles. The low load scratch tests are relevant to less severe abrasion. In particular, the multiple pass scratch testing shows how abrasion damage builds up as repeated abrasion occurs.
In the scratch testing it was found that fracture was a predominant form of damage to both hardmetals and ceramics. In the case of the hardmetals the fracture was on a fine scale, but with the ceramics fracture occurred on a larger scale, often removing large fragments of material.
There was a general decrease in the scratch damage to the samples as the hardness of the materials was increased, but the results were not clear cut.
By contrast, in the ball cratering tests on the hardmetals, there was a small increase in wear as the hardness of hardmetals was increased. Wear occurred by a two stage process with mechanical removal of the binder phase followed by fracture of the WC grains.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMMT(A)175
Subjects:	Advanced Materials Advanced Materials > Powder Route Materials
Last Modified:	02 Feb 2018 13:18
URI:	http://eprintspublications.npl.co.uk/id/eprint/1140

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