Metal Powder Injection Molding Process

At present, the main feeding material for titanium alloys refers to uniformly mixing a certain amount of titanium alloy metal powder and binder at a certain temperature and in a certain proportion to obtain a powder and binder mixture suitable for injection molding. The preparation of uniform feed is the key to obtaining high-precision powder injection molding products. If the feed is mixed unevenly, the binder will produce defects such as deformation during the degreasing process and uneven sintering shrinkage, thereby increasing the dimensional deviation of the final sintered body. Therefore, the preparation of the feed plays a decisive role in the accuracy of the MIM product. At present, the research on MIM titanium and titanium alloys has made certain progress, but large-scale industrial application still faces certain difficulties, mainly due to the following points:

1. Low-oxygen spherical titanium and titanium alloy powders are expensive. Domestic spherical titanium and titanium alloy powder manufacturers have developed rapidly in recent years.

2. The selection of binder and degreasing removal process; the selection of binder determines the amount of powder filling, which has a direct impact on the density, shrinkage and surface roughness of the sintered product, and the efficient degreasing and removal process helps It reduces the influence of impurity elements such as carbon and oxygen and improves product performance.

3. Sintering process optimization and equipment requirements. Due to the high activity characteristics of titanium alloys, the control of temperature and oxygen content during sintering is crucial, which places higher requirements on the sintering furnace.

In the field of titanium material MIM, the main focus is on titanium alloy powder and its feeding preparation. At present, pure titanium powder, Ti-6Al-4V, TiAl, Ti-Mo-Al and some other titanium-based material powders have been successfully manufactured using the injection molding process.