Application of Large Box type Resistance Furnace in Powder Metallurgy Industry

The application of large box type resistance furnaces in the powder metallurgy industry is mainly reflected in the sintering of metal powders, the combination of metal ceramic compounds, the melting of low melting point metals or alloys, and the heat treatment of sintered parts.

1. Metal powder sintering
Sintering is a crucial step in powder metallurgy technology. A large box type resistance furnace can provide a uniform and stable high-temperature environment, allowing metal powder particles to combine with each other through mechanisms such as diffusion and recrystallization, forming metal products with certain strength and performance. For example, in the production of iron-based powder metallurgy parts, the pressed green body is placed in a large box type resistance furnace for sintering. By precisely controlling the sintering temperature, time, and atmosphere, high-density and high-strength parts can be obtained.

2. Metal ceramic compound combination
Powder metallurgy often involves the composite of metal and ceramic materials, and large box type resistance furnaces can meet the temperature and atmosphere requirements during the chemical process. At high temperatures, metal powders react chemically with ceramic powders to form metal ceramic compounds with special properties. For example, in the preparation of hard alloys, tungsten carbide powder is mixed with cobalt powder and placed in a resistance furnace. Under high temperature and reducing atmosphere, cobalt and tungsten carbide combine to form hard alloys with high hardness and wear resistance.

3. Melting of low melting point metals or alloys
For some low melting point metals or alloys, such as lead, tin, zinc, and their alloys, large box type resistance furnaces can be used for their melting process. In powder metallurgy, it is sometimes necessary to melt low melting point metals or alloys and mix them with other powders to prepare composite materials with special properties. For example, by melting lead tin alloy and mixing it with copper powder, powder metallurgy bearing materials with good anti friction properties can be prepared through pressing and sintering.

4. Heat treatment of sintered parts
Sintered powder metallurgy products usually require heat treatment to further improve their properties. Large box type resistance furnaces can precisely control the heating and cooling processes according to different heat treatment process requirements, such as annealing, quenching, tempering, etc. For example, quenching and tempering of sintered steel based powder metallurgy parts can improve their hardness, strength, and toughness, meeting different usage requirements.