Preparation and Study of Carbide-Sialon Composite in SiC-SiAlON-Al2O3 System

Goal: Synthesis of SiAlON by reaction coating method using aluminosilicate natural raw material geopolymer (kaolin), corundum and silicon carbide on its basis obtaining a composite with high physical technical properties hot pressing for use in armor rocket technology. For the intensification sialon formation sintering processes, influence various additives was studied, such as: aluminum powder, elemental silicon, yttrium magnesium oxides. Method: A SiAlON-containing an open porosity 15% - 16% obtained metallothermic process reactive annealing nitrogen. The resulting milled to dispersion 1 3 μm pressed at 1620°C obtain product density performance properties. We studied microstructure X-ray phase, optical electronmicroscopy analysis methods. Result: In selected composition β-SiAlON formed 1400°C instead 1800°C, which due mutual initial materials:geopolymer kaolin, perlite, corundum, aluminum, SiC, development is facilitated vitreous dopant perlite (96 glass phase). eutectic low temperatures, creates good prerequisite intensive diffusion processes other components. Conclusion: SiC-SiAlON-Al2O3 system pressing, following properties: strength limit compression 1940 MPa, bending it 490 MPa. making has been phase electron microscopy are modern research