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The electroless nickel composite (ENC) with various silicon carbide contents was deposited onto aluminium alloy (LM24) substrate. The wear behaviour and the microhardness of the composite coating samples were investigated and compared with particles free and aluminium substrate samples using micro-scale abrasion tester and microhardness tester respectively. The wear scar marks and wear volume were...
This paper reports a study on the tribology of a diamond-like carbon (DLC) coating rubbed against stainless steel and brass in a hard water environment at 20, 50 and 80°C for water hydraulics applications. Hard water designed to simulate tap water in London containing 95mg/L Ca 2+ was used. DLC containing 30at% hydrogen was deposited on AISI 630 stainless steel using an unbalanced magnetron...
Ni–B coatings have been deposited directly on commercial purity magnesium and AZ91D alloy and characterized using glow discharge optical emission spectroscopy, scanning electron microscopy, X-ray diffraction and, for tribological and mechanical evaluation, dry sliding wear and friction testing and microhardness measurement. The boron content of the coating on Mg was slightly lower than that of the...
The effects of water environment on tribological properties of DLC against stainless steel were studied for development of the hydraulic pumps, valves and cylinders based on metal. A ball-on-disk tribotester was developed for detailed examination of water environment, such as temperature (20–80°C), dissolved oxygen (0.01–8ppm), water pressure (0.1–20MPa) and dissolved ions. DLC was deposited on the...
The wear characteristics of small (49mm diameter) coal logs (i.e. compacted coal cylinders) having an approximate length of 76mm were tested in a steel pipe in the laboratory. For each individual test, three identical coal logs were compacted from the same batch of materials under the same compaction conditions. Six factors that affect coal log wear were varied in the tests, one at a time, to assess...
The tribological behaviour of polyetheretherketone (PEEK) filled with nanometer ZrO 2 was studied. The composite blocks with different filler proportion and particle size were prepared by compression moulding. The friction and wear properties of nanometer ZrO 2 -filled PEEK were investigated under ambient conditions on a block-on-ring machine by running the PEEK composite block against...
A nano processing technique was used to produce TZP-graphite self-lubricating ceramics. The nano size ZrO 2 powder was prepared by a co-precipitation method. The TZP-graphite composites were produced by a hot-pressing (HP) fast-sintering technique. Wear and friction properties of these composites were determined on a ball-on-disc tribotester in air and water and it was found that the graphite...
The wear mechanisms of HP sintered 3Y-TZP ceramics under different sliding conditions were investigated in this paper. The tribological tests were carried out under dry reciprocating sliding using GCr15 steel ball on 3Y-TZP ceramic disk geometries at ambient temperature. The load varied from 2 N to 100 N and the speed varied from 0.01 m s -1 to 0.4 m s -1 . Wide ranges of...
An equation has been proposed to describe sliding wear caused by microfracture in polycrystalline alumina ceramics. The wear equation has been simplified, and grain size dependence for dry sliding wear data by Wu et al. has been shown to agree with this equation. For lubricated sliding in a ball-on-flat configuration, modification of the equation is necessary. A concept of equivalent 'real' contact...
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