1. Introduction

Powder metallurgy is an industrial technology that uses forming and sintering to create metal materials, composite materials, and many sorts of products from metal powder or a mixture of metal powder and non-metal powder as raw materials. Powder metallurgy technology provides a number of advantages, including large energy savings, material savings, great performance, high precision, and product stability, making it ideal for mass production. Furthermore, some materials and complex pieces that cannot be prepared using traditional casting and machining procedures can be created using powder metallurgy technology, generating significant industrial interest.

2. Features and applications

Powder metallurgy is used to make porous, semi-dense, or fully dense materials. Powder metallurgical materials have a distinct chemical composition as well as physical and mechanical properties that traditional casting processes cannot achieve, such as controlled porosity, homogeneous material organization, no macroscopic segregation, and the ability to be molded in a single step. Typically classified into seven categories based on their intended usage.

(1) Friction-reducing powder metallurgy materials. Also referred to as sintered friction-reducing materials. By immersing the material in pore lubricating oil or in a material composition containing friction reducing agents or solid lubricants. Widely utilized in the production of bearings, bearing bushings, and end seals, among other things.

(2) Porous powder metallurgy materials. Porous sintered materials are another name for porous sintered materials. Permeability and thermal and electrical conductivity are excellent, as are resistance to high and low temperatures, thermal shock, and media corrosion. Filters, porous electrodes, fire extinguishing devices, anti-freeze devices, and other products are made from it.

(3) Material for powder metallurgy structure. Also referred to as sintered structural materials. Can endure tensile, compression, twisting, and other loads, as well as working in frictional wear situations.

(4) Friction materials based on powder metallurgy. Also referred to as sintered friction materials. With high strength, high temperature resistance, strong thermal conductivity, anti-seize, corrosion resistance, and other properties, it is mostly used in the production of clutches and brakes.

(5) Tooling materials for powder metallurgy. Cemented carbide, powder metallurgy high-speed steel, and so on. The latter has a uniform structure, fine grain, no segregation, and a long service life. Can be utilized in the production of cutting tools, molds, and poor component parts.

(6) Electromagnetic powder metallurgy materials. Electrical and magnetic materials are included. Soft magnetic materials include magnetic powder, magnetic powder core soft magnetic ferrite, moment magnetic ferrite, pressure magnetic ferrite, microwave ferrite, positive ferrite, and powder silicon steel, among others, and are used as electrodes with tungsten copper, tungsten nickel copper, and other powder metallurgy materials.

(7) High temperature powder metallurgy materials. Powder metallurgyhigh temperature alloys, refractory metals and alloys, metal ceramics, dispersion reinforced and fiber reinforced materials are examples of these materials. High-temperature turbine discs, nozzles, blades, and other high-temperature resistant parts are made with this material.

3. Metallic powder

Metal materials used in powder metallurgy include iron, nickel, copper, tungsten alloys, and others.

Some of the physical drawings of metal powder and electron microscope drawings are displayed here.

(1)

 

No.BNi-1 nickel-based brazing material

Features: high chromium content, good corrosion resistance, good high temperature performance, ability to handle high stress, high brazing seam remelting temperature

Uses: Vacuum brazing, stainless steel brazing, alloy steel brazing, high-temperature alloy brazing, cemented carbide brazing, and more processes are available.

2.

 

No. CuZn48 copper-zinc-copper based brazing material

Features: strong plasticity and strength, good machinability, and simple welding

Uses: Soft belt for machine tool guides, tetrafluoro seal material, sintered diamond tool carcass, resin-based brake pad, imitation brass craft coloring, and so on.