What is sintering:

Sintering process is a comprehensive process of many physical and chemical changes. This process is not only complicated, but also rapidly changing. In a few minutes or even seconds, the sintered material is heated from below 70 ℃ to 1200 ~ 1400 ℃ due to strong heat exchange. At the same time, it also changes from solid to liquid, and then the liquid is rapidly cooled and solidified. These physical and chemical changes include:

(1) Fuel combustion and heat exchange;

(2) Evaporation and condensation of water;

(3) Decomposition of carbonate, volatilization of volatile in fuel;

(4) Oxidation, reduction and decomposition of iron minerals;

(5) Oxidation and removal of sulfide;

(6) Solid phase reaction and liquid phase formation;

(7) Cooling and condensation of liquid phase and reoxidation of sinter, etc.

After the sintering material is ignited, the sintering process is carried out from top to bottom. According to the change of the material layer, the sintering process can be carried out along the

The height is roughly divided into five zones, namely sinter zone, combustion zone (sintering zone), pre tropical zone, drying zone and over humid zone. Among the five zones, the combustion zone and the over wetting zone have the greatest resistance, followed by the pre heating zone and the drying zone, and the sinter zone is the smallest.

Because the sintering process has the above characteristics, the vacuum degree and temperature increase with the sintering time

In production, the "end point" of sintering is controlled by the change of temperature or vacuum degree of the bellows.

Powder sintering is to mix various raw materials into pellets according to the proportion, and then sinter them on the sintering machine.

Technological process of metal sintering:

Mold design: design a reasonable mold according to the product structure (the mold material usually uses graphite or steel);

Ingredients: according to the product requirements, convert the filler volume and reasonably allocate the use proportion of each material;

Mixing: add the prepared materials into the load-bearing iron chain, put them into the mixing bucket together, tighten them, and fix them on the mixer for mixing;

Filler: weigh an appropriate amount of material according to the product list, fill it evenly into the mold cavity, and compact it;

Sintering: set sintering parameters for sintering;

Post processing: according to the product requirements, select different processing equipment, such as spark machine, internal and external grinding, etc. for machining, so as to achieve the drawing structure and size.

Advantages and application fields of metal sintering products:

With good self sharpening, high strength, wear resistance and long service life, it is widely used in electronics, optics, architecture, furniture, automobile and other industries