Preparation method of ZrN-SiAlON-SiC-C complex-phase fireproof material

Abstract

The invention relates to a preparation method of a ZrN-SiAlON-SiC-C complex-phase fireproof material, and belongs to the field of fireproof materials. Bauxite and zirconite are served as raw materialsto prepare ZrN-SiAlON fireproof powder, a sugarcane solution is served as a binding agent to combine 120-mesh SiC and 325-mesh SiC, the material is formed and subjected to thermal treatment at the temperature of 1500 DEG C to prepare the ZrN-SiAlON-SiC-C fireproof material. When the mass ratio of the ZrN-SiAlON fireproof powder to 120-mesh SiC to 325-mesh SiC is 2 to 4 to 4, the breaking strengthof the fireproof material is 3.53 MPa, the apparent porosity is 41.10%, and the volume density is 1.76g / cm<3>. When the mass ratio is 3 to 3.5 to 3.5, the breaking strength of the fireproof materialis 4.32 MPa, the apparent porosity is 45.79%, and the volume density is 1.57g / cm<3>. When the mass ratio is 4 to 2 to 2, the breaking strength of the fireproof material is 4.39 MPa, the apparent porosity is 53.23%, and the volume density is 1.36g / cm<3>. When the mass ratio is 4 to 2 to 2, the breaking strength of the fireproof material is 4.25 MPa, the apparent porosity is 50.61%, and the volume density is 1.41g / cm<3>. The preparation technology related to the invention can be an effective high-technology and low-cost route to prepare high-performance ZrN-SiAlON-SiC-C fireproof material products.

Description

Technical field: [0001] The invention relates to a preparation method of a ZrN-SiAlON-SiC-C composite refractory material, belonging to the field of refractory materials. Background technique: [0002] In the entire material system of refractory materials, in addition to oxide refractory materials, carbon-containing refractory materials are high-performance non-oxide refractory materials developed with the advancement of iron and steel smelting technology, and are an important part of the classification of refractory materials. The excellent slag erosion resistance and thermal shock stability can greatly increase the service life of metallurgical furnaces, increase the output of steel and reduce the unit consumption of refractory materials, and the economic and social benefits are remarkable. The development of new low-carbon non-oxide composite refractory materials has become an important development direction recognized by the world's peers. The raw materials used for non...

AI Technical Summary

Problems solved by technology

However, the ZrO-containing 2 , ZrN, ZrC and other multi-phase high-temperature resistant materials are expensive, and are only used in extreme high-temperature and harsh conditions such as aerospace, high-temperature industrial key components, etc.

In refractory materials, ZrO is only used in parts such as slide plate holes and sizing nozzles. 2 Materials, there are not many reports about the application of ZrN, ZrC, etc. in high-performance refractory materials, mainly due to the high price and difficulty in preparation.

[0004] In addition, non-oxide phases such as ZrN and SiAlON need to be prepared at very high temperatures and protective atmosphere conditions to obtain corresponding high-temperature-resistant products, and it is difficult to sinter them under the high-temperature sintering conditions of the usual refractory industry (generally not exceeding 1780°C) High Strength Block Refractories

Therefore, it is difficult to use ZrN and SiAlON multi-phase non-oxide refractory raw materials to prepare high-performance high-temperature-resistant material products using the ultra-high temperature sintering process of traditional refractory materials, which will also lead to high energy consumption and high cost

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