Surface modification of Ti alloys with WC-TiB₂-reinforced laser composite coatings

Abstract

Laser cladding of the TiAl/Fe+Co-coated WC+TiB2 pre-placed mixed powders on a Ti-6Al-4V alloy substrate can be used to form TiB2/α-W2C-reinforced composite coating, which improved the wear resistance of the substrate. To further improve the TiB2/α-W2C-reinforced composite coating, yttria partially stabilized zirconia (YPSZ) was added into the pre-placed powders. A metallurgical bonding was formed between the YPSZ-infused composite coating and the substrate. Many amorphous alloys were produced in this composite coating due to the action of YPSZ, and such coating showed fine microstructure. Thus, it is feasible to further improve the wear resistance of the laser clad TiB2/α-W2C-reinforced composite coating through the addition of YPSZ.

Recent developments in fabrication of ceramic particle reinforced iron matrix wear resistant surface composite using infiltration casting technology

“…The latter improves the infiltration between the molten metal and the ceramic particles. In recent years, Li et al 37,38 studied the infiltration casting process of WC p / iron matrix composite. They found the matrix microstructure and performance could be effectively improved by adding proper amount of aluminium powder, ferrochromium powder or ferromolybdenum powder into the promoter, and the Fe 2 O 3 slag could be partially removed at the same time, base on which the infiltration promoter (binder, flux and auxiliary materials) for WC p reinforced iron matrix surface composite was invented to fabricate guide plates.…”