Stainless Steel Parts	Bushing or Sleeve bearing
Automotive Parts	Power Tool Parts

Description: :               

Forming method of metal powder in molds by the way of compressing and heating is known as powder metallurgy.

Metal powder is material of powder metallurgy. It is a process through which products are produced by high pressure and sintering. Powder metallurgy technique has three steps. First, the material is treated to make powder of fine articles; second, the powder is fed into the chamber of molds uniformly, and then high pressure is applied to form the shapes and sizes of green compact; finally, the green compact is sintered.

Why powder metallurgy?
1. Technique
(1) It produces “alloy” of parts, which can hardly be made. Many metals being not intersoluble in liquid or solid state, or very different in melting point, can be processed with powder metallurgy. For example, electric brush of a motor is made of mixture of copper and graphite powder; copper-lead material for a kind of bearing is another classic example.

(2) It compound metal and non-metal into material with useful properties, which is not applicable to other methods; for example, an abrasion resistant made of copper, iron, and asbestos, as well as a heat resistant material made of nickel-alumina.

(3) It produces metal parts which have high melting point and are not applicable for casting. At early this century, Edison found wolfram made the most durable filament for bulb. But metallurgy technique could not make wolfram filament which was not brittle. Kudlitz (1873-1975) found that by sintering compressed wolfram thread under temperature lower than its melting point and then heat treating it at high temperature could draw tough fine filament under room temperature. This finding was applied to process of other metals with high melting points such as molybdenum, tantalum, and so on. Simultaneously, thanks to the advancement, cobalt tungsten carbide for metal cutting tools produced by the way of sintering emerged sequentially.

(4) It produces parts which have special structure and property. For example, automatic lubricated bearing is a porous bearing made by powder metallurgy. When the machine part runs, the lubricant which has been injected into the pores penetrates out automatically due to the effect of heating. In addition, a porous filter which serves to diffuse, separate, and regulate liquid is a common example.

2. Economic factors
In this category powder metallurgy stands out, it is not because the products powder metallurgy produces are special but that the characteristics of its production process involves economic factors which overwhelms other production technologies such as casting and forging.
(1) Scrap reduces, indicating high material utility rate.
(2) Cutting is almost not necessary, indicating cost of process and material is saved.
(3) High production efficiency easies automation.
(4) High consistence in products lowers rate of returned goods.
(5) Uniform chemical ingredients make excellent quality.