Papers by Keyword: Grain Abrasion

Abstract: In this work, tungsten inert gas cladding (TIG), is utilized to in-situ synthesize the (Ti,W)C based cermet cladding layers. The microstructure and microhardness of the cladding layers were analyzed by scanning electron microscopy (SEM) and microhardness tester. The grain abrasion resistance of the cladding layers is also discussed. The grain abrasion resistance of the coating is also discussed. The results showed that excellent bonding between the coating and the AISI 1045 steel substrate was uniform, continuous and almost defect-free. (Ti,W)C cladding layers have compact microstructure and high microhardness. The grain abrasion resistance of the coating is attributed by the compact microstructure.

Abstract: In this work, a new method, electro-thermal explosion ultra-high speed spraying (EEUSS), was utilized to synthesize the titanium carbide based and nickel bonded (TiC-xNi) coatings. The nickel content was varied at the weight percents of 5, 10, 15 and 20%. The microstructure and properties of the coatings were studied by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and microhardness tester, respectively. The TiC-xNi coatings had the metallurgical bonding with the substrate, and consisted of submicron grains. The grain abrasion tests results showed that the abrasion resistance of the coatings was affected by the contents of Ni.

Abstract: Plenty of studies on wear mechanism of diamond grains show that the specific failure form of single diamond grit has a close relationship with its load. Monolayer diamond grinding wheels and samples for shearing test are prepared by a high frequency induction brazing technique in this paper. The normal abrasion mechanism of diamond grains has been found through the comparison between the single grain tangential load during grinding and the shearing failure-load of the single grit of the test samples. The result shows that the dynamic strength of diamond grains is relative to the static strength after being brazed. Most of the grains are micro-broken during grinding, and only a few of them are pulled-out or broken-off.