All about Alloy Powders
Alloy powder is a powdery substance formed by alloying two or more metal elements (or metal and non-metal elements) through an alloying process, with characteristics such as high specific surface area and easy forming and sintering. Its classification methods are diverse, and it can be divided into binary, ternary, and multicomponent alloy powders according to its composition; According to their applications, they include hard alloys, magnetic alloys, high-temperature alloys, and other types.
- Definition
- Features
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What is Alloy Powder?
The alloy powder materializes from the process of combining two or more metal elements together with or without non-metal elements. Alloy powder production typically involves atomization techniques, electrolysis procedures, or mechanical alloying methods. The atomization process enables immediate transformation of molten alloy liquid into powder form. The properties of alloy powder such as high specific surface area combined with straightforward molding and sintering processes and uniform composition make it ideal for precision manufacturing applications.
What are the Features of Alloy Powders?
High Strength and Lightweight
Alloy powder can achieve a combination of high strength and low density through composition design.
Wear and Corrosion Resistance
Nickel based, iron-based and other alloy powders have excellent wear resistance and corrosion resistance.
Excellent Conductivity, Thermal Conductivity, and Biocompatibility
Some alloy powders have electrical conductivity, thermal conductivity, and biocompatibility.
What are the Applications of Alloy Powders?
Electronic Power Field
Alloy powder can be used for the manufacturing of heat dissipation and conductive devices, as well as high-frequency electronic components.
Medical Device Field
Titanium alloy powder is processed into artificial joints, dental implants, etc., utilizing its biocompatibility and corrosion resistance.
Industrial Protection Field
Nickel based alloy powder forms wear-resistant and anti-corrosion coatings through thermal spraying technology, extending the service life of industrial equipment.
Energy and Chemical Industry
Corrosion resistant alloys are used to manufacture high-temperature reactors and corrosion-resistant components.
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Question and Answer
Case Study
Synthesis of Titanium and Its Alloys for Biomedical Applications
Jang, Tae-Sik, et al. Biomedical engineering letters 10 (2020): 505-516.Powder-based Additive Manufacturing (AM) technology of Ti and its alloys has attracted great attention in biomedical applications due to its advantages such as customized manufacturing, cost, time and resource saving. The performance of the AM implant or stent depends largely on the various AM technologies and the quality of Ti and its alloy powders. The selected technologies include laser-based metal powder bed fusion (PBF-LB/M), metal electron beam powder bed fusion (PBF-EB/M) and directed energy deposition used in biomaterial production, as well as powder feeding systems for binder jetting.
The plasma rotating electrode process was developed by modifying the rotating electrode process (REP) by replacing the heat source with a transferred arc plasma torch to avoid tungsten contamination. PREP is performed in a stainless steel chamber. The rapidly rotating metal electrode rod is melted in a helium environment using a helium plasma torch and centrifugal force generated by the rotation. Helium is selected because of its heat transfer and arc characteristics. The rotation speed is generally between 3000 and 15,000 rpm. The molten liquid rotates and forms droplets, which solidify in flight. The particle size of the prepared Ti-6Al-4V powder is about 100-300μm.
