Two Component Materials in Powder Metallurgy: A Review Paper Focused on the Processing Technique Applied in Powder Metallurgy

Abstract

Processing two materials which have different properties gives significant impact to the industries due to their amazing properties which leads in improving the functionality and reliability of products. Many materials have been investigated in terms of layering, bi-material and also co-injection molding process. The two materials may be metal-metal, ceramic-ceramic and metal-ceramic depending on the capabilities requirement. Several techniques have been discussed in this paper regarding improving the hardness properties, magnetic/nonmagnetic and many more. This paper focused on reviewing the methods that were implemented by researchers based on the bonding techniques of two materials. However, both combination metal-metal and metal-ceramic are the most challenging due to their different properties in terms of thermal expansion. For example, in order to control the coefficient thermal expansion (CTE) for each material, before implementing the required process, dilatometer studies are needed. Such study provides an overview on how to suit the diffusion mechanism between the two materials. The benefits and drawbacks for each method were discussed. According to previous researches, the joining of materials such as M2/17-4PH and 17-4PH/zirconia via co-injection molding process have been successful. Such finding is important to evaluate how good the bonding between the two materials is based on the morphology observation at the interface.