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Alternative powder metallurgy processing methods

wallpapers News 2021-02-04
Titanium and its alloys have been used in a variety of applications, especially human implants and automotive body parts, and are widely accepted due to the possibility of obtaining a unique combination of excellent mechanical and chemical properties and excellent biocompatibility. However, due to high processing costs, complexity related to manufacturing/thermomechanical processing conditions, processing-related issues and material waste in traditional processing methods, cost-effective near-net-shape material batch processing is still an important technical issue. Generally, it is found that powder metallurgy (PM) processing methods can solve these problems very effectively.
In order to achieve technical simplicity and economic development, some efforts have been made to prepare bulk titanium alloys by conventional PM technology, that is, cold pressing of element alloy powders and then pressureless sintering (pressure sintering). Cost-effective near net shape process. However, the high initial cost of pure titanium and pre-alloyed titanium powder, the high reactivity of the powder with oxygen in each step of the manufacturing process, and poor mechanical properties due to porosity and chemical heterogeneity limit conventional pressing And sintering. Powder metallurgy methods are used for various commercial purposes.
In recent years, an alternative powder metallurgy processing method has been considered, which is based on mechanical alloying (MA) of elemental powders, followed by rapid sintering (such as spark plasma sintering) to synthesize various fine-grained structures. Alloy and excellent mechanical properties. Moreover, this method is very effective in preparing a complex alloy system containing constituent alloying elements with very different melting points, which is difficult to prepare by conventional liquid metallurgical methods. However, there is still a need to solve the problem of adhesion of pure titanium powder in vials and balls due to the use of process control agents and grinding and contamination to make it a viable technology.