Titanium Carbide in Wear Resistant Coatings

1996 ◽  
Author(s):  
P. Vitiaz ◽  
A. Verstak ◽  
T. Azarova ◽  
T. Talako ◽  
E. Lugscheider
Keyword(s):  
Titanium Carbide ◽  
Erosion Resistance ◽  
High Velocity Oxygen Fuel ◽  
Temperature Synthesis ◽  
Wear Resistant Coatings ◽  
Carbide Phases ◽  
High Temperature Synthesis ◽  
Carbide Coatings ◽  
Characteristic Features ◽  
Oxygen Fuel

Abstract The poblems of metal-titanium carbide coatings processing by air, low pressure and underwater plasma as well as high velocity oxygen fuel spraying are under consideration. Among the different methods of metal-TiC powders production, like mixing of carbides with scale structure metals, agglomeration with binders, a matter of special interest is the high temperature synthesis of TiC in presence of metallic alloy. The characteristic features of these materials include the carbide phases forming, their bonding with the alloy and reactions during spraying, grain size and their distribution, alloy behavior during synthesis and spraying. Finally, the abrasive wear and erosion resistance of Al-Si/TiC, Fe-Cr/TiC and Ni-Cr/TiC coatings is analyzed.

Desirability-Based Performance Optimization of Wear-Resistant Coatings by HVOF Sprayed WC-Co Experiments

2011 ◽  
Vol 189-193 ◽  
pp. 3633-3639
Author(s):  
Ming Der Jean ◽  
Yih Hwang Yang ◽  
Tzu Hsuan Chien
Keyword(s):  
Wear Rate ◽  
Performance Optimization ◽  
Desirability Function ◽  
High Velocity Oxygen Fuel ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Designed Experiments ◽  
Control Factors ◽  
Desirability Analysis ◽  
Oxygen Fuel

This study presented the desirability function based on Taguchi designed experiments to solve multiple responses statistical optimal problems for the tungsten carbide/cobalt (WC-Co) coatings of high-velocity-oxygen-fuel (HVOF) processes. The eight control factors based on L18 arrays were conducted and the multi-responses of wear-resistant coatings such as hardness, deposited thickness and wear rate were evaluated simultaneously in the desirability-based experiments. Based on desirability analysis, the optimal settings have been identified, and the impacts of control factors are determined by analysis of variance on the multi-responses. Further, a confirmation run was conducted to validate the tests. Experimental results have shown that the hardness increased by 16.61% and the deposited thickness improved by 10.50%, while the wear rate decreased by 34.03%. It was clear that confirmation tests are greatly improved by way of the desirability-based multi-responses on HVOF WC-Co experiments, and these findings achieved the desired values on wear-resistant coatings. The proposed procedure was applied at HVOF sprayed WC-Co experiments, and the implementation results demonstrated its feasibility and effectiveness to maximize hardness, make a target of deposited thickness value and minimize wear rate by a HVOF.

Preparation of WC/Ni Flexible Cloth Coating by Vacuum Brazing

2021 ◽  
Vol 871 ◽  
pp. 112-124
Author(s):  
Zheng Zheng Yang ◽  
Jian Zhang ◽  
Xin Hai Yu
Keyword(s):  
Erosion Resistance ◽  
Impact Angle ◽  
Ball Valve ◽  
304 Stainless Steel ◽  
High Velocity Oxygen Fuel ◽  
Vacuum Brazing ◽  
Valve Disc ◽  
Application Potential ◽  
Three Body ◽  
Oxygen Fuel

In this study, one novel WC/Ni flexible cloth coatings were prepared to enhance the abrasion and erosion resistances and meanwhile to accommodate the complicated component surfaces. Neither precipitation of WC particle nor pores or cracks were detected in the coating. The scarification extent of WC particle decreased with the increase in the WC content. With the abrasion mechanism of three body abrasive wear, the WC/Ni coating with 59.8 wt.% WC (WC/Ni-59.8 wt.%) showed the best abrasion resistance with the wear rate of 0.3% of 304 stainless steel. At 30° of impact angle, the WC/Ni-59.8 wt. % exhibited a superior erosion resistance to that of WC coating developed by high velocity oxygen fuel (HVOF). The application potential of WC/Ni flexible cloth coating for the commercial components was testified by developing the coating on a ball valve disc.

Effect of Gravity on Titanium Carbide Foams by Self-propagation High-temperature Synthesis

1999 ◽  
Vol 14 (4) ◽  
pp. 1516-1523 ◽  
Author(s):  
Yasuhiro Tanabe ◽  
Takashi Sakamoto ◽  
Nobuko Okada ◽  
Takashi Akatsu ◽  
Eiichi Yasuda ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Black ◽  
Titanium Carbide ◽  
Combustion Wave ◽  
Propagation Velocity ◽  
Temperature Synthesis ◽  
Environmental Pressures ◽  
Environmental Pressure ◽  
High Temperature Synthesis ◽  
Microgravity Conditions

Titanium carbide foams are synthesized by a self-propagation high-temperature synthesis technique using carbon black, which generates gases during the synthesis. The synthesis is performed under terrestrial and microgravity conditions. The effects of gravity on the synthesis are evaluated in this study. The foaming is mainly caused by H2O and CO gases from the carbon black. The elongation of the products increases with decreasing environmental pressure and increasing amount of generated gases. Since the gas flows out along the direction of the combustion wave propagation, the products expand only along this direction. The propagation velocity of the combustion wave increases with increasing amount of generated gases and environmental pressure, which is due to the amount of molten Ti transporting into the reaction/preheat zone. Under higher environmental pressures, thermal convection of the environmental gases mainly affects the propagation velocity. However, at lower pressures, the behavior of the molten Ti has a great effect compared with the gases surrounding the specimens.

Sign in / Sign up

Export Citation Format

Share Document