Nitride bonded silicon carbide brick is a refractory product with magnesium oxide (MgO) and chromium trioxide (Cr2O3) as the main components, and perovskite and spinel as the main mineral components. This type of brick has high refractoriness, high temperature strength, strong resistance to alkaline slag, excellent thermal stability, and certain adaptability to acid slag. The main raw materials for manufacturing silicon nitride bricks are sintered magnesia and chromite. The purity of the magnesia raw material should be as high as possible. The requirements of the chemical composition of chromite are: Cr2O330-45%, CaO not more than 1.0-1.5%. The production process of fired silicon nitride bricks is similar to that of magnesia bricks. In order to eliminate bricks in the firing process due to MgO and Cr2O3, Al2O3 or directly combined with silicon nitride bricks.

Nitride bonded silicon carbide bricks have excellent anti-erosion ability, high temperature strength, good chemical stability, high service temperature and strong wear resistance, it is an ideal refractory material used as a lining of a vulcanized bed boiler.

Features

1. Stable volume，good thermal conductivity and long service life.

2. Strong resistance to acid, alkali and various molten metals.

3. They have a hard texture and a Mohs hardness of about 9, which is a hardness material among non-metallic materials, second only to diamond.

4. They have high strength at normal temperature. Under the high temperature of 1200-1400C, they almost maintain the strength and hardness at the same time as the normal temperature. With the different atmosphere of use, the maximum safe use temperature can reach 1650-1750^C.

5. The coefficient of thermal expansion is small. Compared with silicon carbide and other products, it has high thermal conductivity, is not easy to generate thermal stress, has good thermal shock stability, and has a long service life. High temperature resistance to creep, corrosion resistance, extreme cold and heat resistance, oxidation resistance, easy to make products with high dimensional accuracy and meet the requirements.

Application

Nitride bonded silicon carbide bricks are widely used in steel, chemical, non-ferrous metal smelting, machinery manufacturing, waste incineration and other industries. In the iron and steel industry, it is used in the lower part of the blast furnace body, the furnace waist, and the furnace belly. In the non-ferrous metal smelting, it is mainly used for the production of aluminum, copper and zinc. It is used as the lining of the molten pool, spout, and electrolytic cell. It is mostly used as a liner in various strong corrosive media in the chemical industry. It can be used as a liner in the waste incinerator. It is used as a variety of high-temperature furnace materials in the machinery manufacturing and silicate industries.

Physical And Chemical Indicators