Abstract
TiB 2 based self-lubricating ceramic composites with the addition of different content of h-BN were prepared by hot pressing technique and their mechanical properties were tested. Friction and wear experiments are conducted on a MMW – 1A configuration control universal friction and wear testing machine. Friction and wear properties of the ceramic composites under different speed and load were studied. The results show that with the increase of the content of h-BN, the hardness, flexural strength and fracture toughness showed a trend of decrease. When load was fixed, with the increase of rotational speed, the friction coefficient rose and the wear rate were first decreased and then increased. When rotational speed was fixed, the friction coefficient and wear rate first decreased and then increased with the increase of load. In nitrogen, the friction coefficient and wear rate of material were higher than those in the air.
Highlights
Cause of friction is the relative motion between two surfaces contact each other,and inevitably produced friction and wear [1].Ceramic tool because of its high wear resistance, heat resistance, oxidation resistance advantages, has been gradually expanded
Because of its large friction coefficient and fragile, its ues of scope has been limited, so the study of friction and wear properties of ceramic tool materials is very important for development of ceramic cutting tool inspection role
TiB2 With high hardness, high melting point and good oxidation resistance, corrosion resistance and other characteristics, has a good metal gloss [2]. h-BN has very good chemical stability, and it continue to be stable at 2800degrees centigrade temperatures, has good electrical insulation and lubrication, it is very excellent high temperature lubricants [3]
Summary
Cause of friction is the relative motion between two surfaces contact each other ,and inevitably produced friction and wear [1].Ceramic tool because of its high wear resistance, heat resistance, oxidation resistance advantages, has been gradually expanded. Because of its large friction coefficient and fragile, its ues of scope has been limited, so the study of friction and wear properties of ceramic tool materials is very important for development of ceramic cutting tool inspection role. Xu Xiuguo prepared TiB2/WC/h-BN ceramic cutting tools by hot-pressing sintering and experiments for cutting tool materials have good self-lubricating properties [4]. Al2O3/TiC/CaF2(ATF) of ceramic materials by hot-press sintering process, used ring-type friction and wear tester for friction and wear properties of test, and analysised the formation processes and mechanisms of self-lubricating film [5]. Self-lubricating ceramic material specimens was tested friction and wear, and studied the friction-wear properties and wear mechanisms, comparing different h-BN content wear resistance and wear mechanism of ceramic materials, and studied changes of friction coefficient and wear rate of materials under different loads and different. Speeds, analysis the friction-wear properties and morphology.In addition, studied its friction and wear in nitrogen atmosphere compared with in the air, and its wear mechanism in a different atmosphere
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