Cobalt Base Alloy Powder

INTRODUCTION

Thermal spraying technology is widely used in pre-protection and remanufacturing industries. The thermal spraying techniques are coating processes in which melted (or heated) materials are sprayed onto a surface. Coating materials include metals, alloys, ceramics, plastics and composites. They are mostly fed in powder form. Thermal Spray Powders are used in a variety of applications including Plasma Transfer Arc (PTA), Spray and Fuse, High Velocity Oxy-Fuel (HVOF), Laser Additive (3D print).

Typically, these applications require hardness, morphology and a particular particle size distribution. The hardness of powder are between HRC 15 and 70. Particle size distribution can be adjusted according to customer needs.

Cobalt base alloy powder

Cobalt base alloys typically contain tungsten and carbon for strengthening. Carbon has low solid solubility in cobalt and therefore most of its partitions are in WC, W2C, M6C or other carbides. These hard phases have a strengthening effect, giving such alloys high hardness and strength at temperatures under 800P. The cobalt-chromium-tungsten-carbon alloys generally have excellent properties to resist high temperature, oxidation and thermal fatigue.

Cobalt has a hexagonal-close-packed (hep) crystal structure at temperatures below 417C. Intrinsically, it has low coefficient of friction resulting in excellent wear resistance. At temperatures above 417C, cobalt transforms from HCP to FCC (face - centered - cubic) crystal structure, thereby, generating thermal stresses. Therefore, it is recommended that in weld overlaying and spraying, the parts being coated are pre-heated to 500-600C to avoid cracking in the coating or overlay.

Specification of Cobalt base alloy powder

PRODUCT PACKING 25kg/barrel, 50kg/barrel, the package can be customized by buyer’s requirements.