1. Keep the gas sintering

Internationally uses a conservation atmosphere sintering metal box bowl, and this method also adopts my country's powder metallurgical industry.

The selected maintenance atmosphere includes: pure hydrogen, differential ammonia (hybrid gases of hydrogen and nitrogen), gas, hydrocarbon conversion gas (hybrid gases of H2 and carbon monoxide), etc. The above gas not only plays a maintenance role, but also restores oxides.

When choosing the atmosphere maintenance, we generally choose a mesh -type continuous sintering oven. In order to reduce costs, Italy EBN chose to sinter in a special sealing sintering box. There is an air intake at the bottom of this sintering box, and there is a porous barbaric graphite box in the middle. The product is placed on it. There is a micro -pressure ventilation port. When a certain pressure appears in the tank, the tank actively opens the release of the gas. The size of the sintering box is 900 mm long; the width is 400mm height of 800mm. The gas is pure hydrogen, and the heating method is electric heating. The products after sintering have metallic luster, good quality, and anaerobic phenomenon.

2. Vacuum sintering

Vacuum sintering is a new technology that has developed in recent years. The vacuum is generally 10-1 to 15 _ 5 mm Hg. The advantage of vacuum sintering is: A) Avoid the impact of the atmosphere on the product (such as the hydrogen on the bottom of the graphite box bowl); Essence

The cost of vacuum sintering furnace equipment is expensive, but the production cost of products has gradually been selected by people.