SiC-AlN solid solution and Al2O3-C combined composite sliding plate and preparation method thereof

Abstract

The invention relates to a SiC-AlN solid solution and Al2O3-C combined composite sliding plate and a preparation method thereof, and belongs to the field of refractories. The SiC-AlN solid solution and Al2O3-C combined composite sliding plate is prepared from the following raw materials in percentage by weight: 60-90% of corundum, 1-20% of alpha-Al2O3 micro powder, 1-15% of metallic aluminum, 1-15% of silicon, and 0-5% of powdered carbon, and 2-7% of phenolic resin is added as a binder. During production, the raw materials are mixed evenly according to the proportion, a mud material is obtained through mixing, pressing forming is conducted, drying is conducted for 5-30 h at 120-400 DEG C, then heat preservation is conducted for 1-10 h under the nitrogen atmosphere at 400-660 DEG C, and finally firing is conducted under the nitrogen atmosphere at 1450-1700 DEG C. According to the SiC-AlN solid solution and Al2O3-C combined composite sliding plate, reaction of Al, Si, C and N2 is utilized to synthesize a SiC-AlN solid solution reinforced phase in situ in an Al2O3 matrix, and the excellent properties are realized as follows: the apparent porosity is 5-20%, the volume density is 3.00-3.40 g/cm<3>, and the normal-temperature compressive strength 100-400 MPa. During firing of the SiC-AlN solid solution and Al2O3-C combined composite sliding plate, the ultra-high temperature and highpressure are not needed, the cost of applying a SiC-AlN solid solution to a refractory is greatly lowered, and the SiC-AlN solid solution and Al2O3-C combined composite sliding plate is suitable for industrial production. The SiC-AlN solid solution and Al2O3-C combined composite sliding plate integrates the advantages of metal, non-oxides and oxides, and has good thermal shock resistance, erosionresistance and high-temperature stability

Description

technical field [0001] The invention relates to a sliding plate for continuous casting of steelmaking, in particular to a SiC-AlN solid solution bonded Al for clean steel and low carbon steel continuous casting 2 o 3 -C composite sliding plate and preparation method thereof, belonging to the field of refractory materials. Background technique [0002] The sliding brick is the key component of the sliding nozzle, and it is a component that directly controls the molten steel and determines the function of the sliding nozzle. In the process of use, it needs to withstand the chemical erosion and physical erosion of high-temperature molten steel for a long time, intense and transient thermal shock and mechanical wear, and the use conditions are extremely harsh. Its safety and longevity are the key to the normal operation of continuous casting production one of the factors. Therefore, the skateboard brick must have the characteristics of high strength, wear resistance, corrosio...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to prepare a SiC-AlN solid solution bonded Al that does not require ultra-high temperature and high pressure treatment 2 o 3 -C composite slide, which not only overcomes the single addition of metal aluminum in existing slide materials, which is easy to generate AlN, Al 4 C 3 Such as easy hydration products make the product unable to be stored for a long time, which affects its industrialization; it also overcomes the problem of easy oxidation of SiC synthesized by adding Si alone; at the same time, the production process of this product is simple, and the low temperature of SiC-AlN solid solution is realized through the control of the heating mechanism. Synthesized at normal pressure, the product has excellent high temperature strength, thermal shock resistance, corrosion resistance and oxidation resistance, long service life, and meets the needs of clean steel continuous casting