Boric Acid Self-Lubrication of B2O3-Filled Polymer Composites
作者:
BrianR. Burroughs,
Jong-Hwan Kim,
ThierryA. Blanchet,
期刊:
Tribology Transactions
(Taylor Available online 1999)
卷期:
Volume 42,
issue 3
页码: 592-600
ISSN:1040-2004
年代: 1999
DOI:10.1080/10402009908982258
出版商: Taylor & Francis Group
关键词: Polymers;Self-Lubrication
数据来源: Taylor
摘要:
Utility of boric oxide particles in PTFE and epoxy composite materials, in sliding contact with stainless steel, is explored. Boric oxide filler can provide PTFE with a two-decade reduction in wear rate, to 10−5mm3/N-m. With adequate ambient humidity reduced wear rate can be achieved without inducing counterface abrasion, and the friction of PTFE is further reduced slightly. In such environments, boric oxide fillers can also reduce friction coefficient of epoxy from μ>0.7 to as low as μ=0.07. This lubrication mechanism results from replenishment of lubricous boric acid lamellar solid provided to the sliding interface by reaction of boric oxide with ambient water. Maintenance of the lubricating effect depends upon a sufficient rate of boric acid formation, relative to subsequent removal by wear. It is demonstrated that this formation/removal balance is affected by relative humidity and volume fraction of boric oxide filler, as well as normal load and sliding speed.Presented at the 53rd Annual Meeting in Detroit, Michigan May 17–21, 1998
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