Autowave Synthesis of Cast Oxide Ceramics Al_2O_3-Cr_2O_3 • ZrO_2

摘要

The regularities for the autowave synthesis (SHS) of a cast oxide composite material (Al_2O_3-Cr_2O_3 • ZrO_2) were studied by example of combustion of thermite-type systems under an inert gas pressure. The ratio of starting reagents with optimal zirconia content was determined for the synthesis of the desired product on the basis of analysis of published data and thermodynamic calculations (Thermo program). In the experiments, it was shown that combustion temperature and sample mass are the most important parameters influencing the composition and microstructure of the final product. Optimal conditions for the process control were defined. The final product includes solid solution Al_2O_3-Cr_2O_3 grains located on the boundaries of ZrO_2 particles. The material is promising for production of machine parts working in conditions of intense wear and shock loads in corrosive environments at elevated temperatures (for example, sintering of ceramic cutting tools).