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Effect of heat treatment atmosphere on properties of aluminum carbon materials with aluminum powder
In order to improve the performance of the aluminum carbon material, the ceramic bonded phase is added on the basis of carbon bonding, and the aluminum carbon sample to which the aluminum powder is added is heat-treated at 1300 ° C for 5 h in different atmospheres (Ar, buried carbon and N 2 ), and the sample is measured. The mass change rate, flexural strength, bulk density, apparent porosity and hydration resistance before and after heat treatment, and the microstructure and phase composition of the sample were analyzed by scanning electron microscopy and XRD. The research shows that there are a large number of submicron columnar and column-like whiskers in the material after heat treatment. After Ar heat treatment, there are banded, tapered alumina and a small amount of whiskers. N2 protective heat treatment material There are many granular AlNs produced; the heat treatment atmosphere is different, the microstructure of the material is obviously different, but the formation of Al4C3 cannot be avoided; after the carbonization and N2 protection heat treatment, the material strength is improved and the porosity is lowered; N2 protection heat treatment is most helpful. Improve the hydration resistance of the material.