What Is The Relationship Between Sintering Temperature And Carbon Rods?

When sintered at 1300℃, the large aggregate particles in the MgAloN composite material are tightly surrounded by the small crystal grains generated by the reaction in the matrix. The small crystal grains in the matrix are mostly 300-600nm in size, with rough surfaces and irregular shapes. There is nitrogen in the small crystal grains (chemical composition is AL64.76%, O21.1%, N10.9%, Mg3.94% or AL48.06%, O44.10%, N5.23%.Mg2.62 %) or nitrogen-free. It can be considered that some of the metallic aluminum in the sample fired at this temperature is not completely nitrided.

At 1400°C, the large aggregate particles are also tightly surrounded by the small crystal grains produced by the reaction in the matrix. The energy spectrum analysis data shows that the degree of nitriding is higher than that of sintering at 1300°C. The metal aluminum is basically completely nitrided, and the particles are slightly larger but There are still a large number of sub-micron particles, and the size is more uniform.

After the temperature rises to 1500℃, the large aggregate particles are also tightly surrounded by the small crystal grains formed by the reaction in the matrix. The pores are mostly small pores, and the whiskers generated in the pores, the plate-like crystallites are more, and the octahedral or The development of plate-like crystals is relatively complete, indicating that more gas phases participate in the reaction during the sintering process. The particle size of the small particles is obviously increased and the size is more uniform. The crystal grains produced by the reaction have higher nitrogen content and more nitrides, and the trace chemical elements Si and Ti can be solid-dissolved in the nitrides, reducing their harmful effects. It can be seen that as the sintering temperature increases, the volume density of the product decreases slightly, the apparent porosity increases, and the flexural strength at room temperature also gradually increases. Therefore, high-grade refractories are best produced by sintering in a high-temperature kiln with silicon molybdenum rods as heating elements within the furnace temperature of 1400-1500°C. The products produced in this way can better meet the requirements of the steel smelting industry for composite refractory materials. Demand.