The lubricity of drilling fluid resistant to high-temperature over 200 ℃ is still one the technological breakthroughs. In this study, graphene modified with sodium dodecylbenzene sulfonate (SDBS) was selected as a lubricant. Our results show that fluids have high stability after aging at 240 °C assistance SDBS/graphene. Excitingly, tribological performance test revealed SDBS/graphene exert exce...

the plain carbon steel “ck45” has relatively well mechanical and metallurgical properties and low cost. the purpose of this research was the property evaluation of this steel on abrasive wear and impact for using in plows and other tillage tools. tillage tool should resist in abrasive wear and impact simultaneously. several heat treatments were done on specimens of this steel. a standard test d...

We explored the B-C-O system at pressures in the range 0-50 GPa by ab initio variable-composition evolutionary simulations in the hope of discovering new stable superhard materials. A new tetragonal thermodynamically stable phase B4CO4, space group I4[combining macron], and two low-enthalpy metastable compounds (B6C2O5, B2CO2) have been discovered. Computed phonons and elastic constants show th...

A slurry process was employed to develop advanced environmental barrier coatings (EBCs) for SiC based composites. Yb2Si2O7 and mullite (3 Al2O3?2 SiO2) were chosen as the base materials bond coat enable temperatures beyond melting point of current silicon (1414 °C). Various sintering aids, such mullite, Yb2Si2O7, Al2O3, enabled at 1500 °C – 1550 °C. used top provide water vapor recession resist...

The micro-abrasion of medical NiTi alloy in simulated body fluid was investigated this paper. friction and wear tests were carried out by TE66. surface morphology scar the mechanism examined SEM. rates calculated according to equations. effects load, type size particles considered. Under same particle, particle has little influence on rate. caused SiC are greater than that Al2O3 particle. exper...

Single and multipass two-body and three-body abrasive wear behaviour of various polyaryletherketone composites have been carried out by using a pin-on-disc machine and a rubber wheel abrasion test (RWAT) rig. Abrasive wear studies were conducted under different loads and sliding distances. Comparative wear performance of all the composites at different loads shows that specific wear rate (Ko) o...

Due to the fact that abrasive media can deform flexibly in abrasive flow machining (AFM) making this method easily to polish the complex holes and the curved surface of the hard machining shapes. Although abrasive media dominate the polishing behavior in AFM process, the mechanism of the abrasive media are not easy to understand because of the high viscous gels, therefore, many finishing works ...

Abrasive machining is one of the most non-conventional processes for finishing. It is widely used in industry to machine the materials like mild steel, aluminum, copper, titanium, glass, hard rock material, graphite, composite material, ceramics etc.Like in abrasive jet machining. This technique uses jet which contains abrasive material. Now a day water-magnetic abrasive machining is one of the...