Author: Site Editor Publish Time: 28-09-2023 Origin: Site
1.Introduction of alloy powder
Alloy powders are mainly classified according to their composition, including iron alloy powder, copper alloy powder, nickel alloy powder, cobalt alloy powder, aluminum alloy powder, titanium alloy powder, and precious metal alloy powder.
(1) NICKEL BASE POWDER：
These powders indude Ni-B-Si, Ni-Cr-B-Si, Ni-Cr-B-Si-P. Ni-Cr-B-Si-Cu-Mo, Ni-Cr-B-Si-W, Ni-Cr, and Ni-Cu alloys. They are used for applications demanding corrosion resistance or oxidation resistance. Under 500°℃, they have excellent low-stress abrasion and adhesive wear resistance, These powders can be applied by a variety of processes, such as, oxyacoetylene spraying or overlaying, HVOF/HVAF spraying, plasma transferred arc (PTA) overlaying, plasma spraying, laser cladding, induction fusion, centrifugal casting, 3D printing and powder metallurgical process- ing. Key applications include valve gates, ball valve surface, valve seats, pistons, extrusion screws, barrels, glass molds, steel mill rolls, wire drawing rolls, oil pumping shafts, fan blades, screw conveyors and tungsten carbide tools.
(2) COBALT BASE POWDER：
Cobalt base alloys typically contain tungsten and carbon for strengthening. Carbon has low sold solubilty in cobalt and therefore, most of it partitions in WC, W2C and M6C or other carbides.These hard phases have a strengthening effect, making such alloys maintain high hardness and strength at temperatures under 800°C. The cobalt-chromium-tung- sten-carbon alloys generally have excellent properties to resist high temperature wear, oxidation and thermal fatigue. Cobalt has a hexagonal-close-packed (hcp) crystal structure at temperatures below 417°℃. Intrinsically, it has low coefficient of friction resulting in excellent wear resistance, At temperatures above 417°C, cobalt transforms from hop 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 500-600°C to avoid cracking in the coating or overlay.
(3) IRON BASE POWDER
Iron base powder are basically iron–carbon alloys with addi- tions of chromium, boron and silicon. They are typically used on mechanical parts for resisting wear and weak acid corrosion under the temperature of 500℃. Even though their properties are not as good as nickel,cobalt base alloys,they are readily available and inexpensive, making them popular in less critical applications.
(4) LASER CLADDING ALLOY POWDER：
With the significant advancement made in laser technology, laser cladding has gained increasing acceptance. Compared to the traditional overlaying processes, it has the advantage of low distortion, low dilution, near net shape after cladding, and fine microstructure for superior properties. However, because of concentration of heat, it could cause stress cracking. Based on our understanding of the laser cladding process, we had developed a family of powders especially for laser cladding.Our customers have endorsed them unanimously.
2.Advanced Atomiazation Technology
(1) Vacuum Induction Inert Gas Atomization
Nickel 、Cobalt、 Aluminium、Custom alloys
High Spherical shap Size Distribution:0-150μm High purit
(2) Electrode Induction Gas Atomization
Titanium 、Ti-Al 、Ni-Ti、 Refactory metals
High Spherical shap Size Distribution:0-150μm High Purity
(3) Plasma Rotating Electrode Process
Titanium 、Nickel、 Cobalt 、Steel
Superior flowability Size Distribution:30-300μm High purity
(4) Plasma Atomization
Titanium High Spherical Size Distribution : 0-150um High purity
SLM、Laser cladding、HIP、PM、MIM、Thermal Spraying