Preparation method of ZrN-SiAlON-SiC-C complex-phase fireproof material

[0023] Example 1

[0024] Choose 200 mesh bauxite (from Yangquan, Shanxi, the main chemical composition is Al 2 O 3 , 62.70%; SiO 2 , 23.13%; Fe 2 O 3 , 7.38%; TiO 2 , 5.76%; others, 3.03%) and 200 mesh zircon (the main chemical composition is ZrO 2 , 69.11%; SiO 2 , 21.17%; HfO 2 , 3.00%; TiO 2 , 2.13%; Al 2 O 3 , 2.06%; others, 2.53%) as raw materials, coke (purchased from China New Times Co., Ltd., carbon content of 83.72wt.%, particle size of 200 mesh) as reducing agent, mixed according to the mass ratio of 7:3:2.42 The raw materials are mixed by dry ball milling and passed through a 200-mesh sieve. The powder is then placed in a corundum crucible and placed in a vacuum atmosphere furnace. Nitrogen is introduced at a flow rate of 0.3 to 0.5 L/min. The temperature is maintained at 1600°C for 4 hours. Nitriding synthesis of ZrN-SiAlON refractory powder. Weigh the synthesized ZrN-SiAlON refractory powder, 120 mesh SiC and 325 mesh SiC according to the mass ratio of 2:4:4, pour the ZrN-SiAlON and SiC powder into the mixing tank, start the mixer until the ZrN-SiAlON and SiC are mixed Uniformity; Pour the prepared binder sucrose solution into the uniformly mixed granular material, and start the mixer again to stir for 2 hours until the powder and binder are evenly mixed. Pour the uniformly mixed materials into the tray, and then put the mixture into a 6mm×6mm×45mm sample mold, and shape it at a pressure of 5MPa for 30s. Put the molded sample into a cold isostatic press and keep it at 150MPa. Press for 90s. Finally, put the shaped strip sample into an oven for drying, set a specific drying temperature and time, and place the shaped sample under the condition of buried carbon at a specific temperature for heat treatment for 3 hours. ZrN-SiAlON-SiC-C multiphase refractory can be obtained. The maximum flexural strength of the multiphase refractory material is 3.53MPa, the apparent porosity is 41.10%, and the bulk density is 1.76g/cm 3.

[0025] Example 2

[0026] Choose 200 mesh bauxite (from Yangquan, Shanxi, the main chemical composition is Al 2 O 3 , 62.70%; SiO 2 , 23.13%; Fe 2 O 3 , 7.38%; TiO 2 , 5.76%; others, 3.03%) and 200 mesh zircon (the main chemical composition is ZrO 2 , 69.11%; SiO 2 , 21.17%; HfO 2 , 3.00%; TiO 2 , 2.13%; Al 2 O 3 , 2.06%; others, 2.53%) as raw materials, coke (purchased from China New Times Co., Ltd., carbon content of 83.72wt.%, particle size of 200 mesh) as reducing agent, mixed according to the mass ratio of 7:3:2.42 The raw materials are mixed by dry ball milling and passed through a 200-mesh sieve. The powder is then placed in a corundum crucible and placed in a vacuum atmosphere furnace. Nitrogen is introduced at a flow rate of 0.3 to 0.5 L/min. The temperature is maintained at 1600°C for 4 hours. Nitriding synthesis of ZrN-SiAlON refractory powder. Weigh the synthesized ZrN-SiAlON refractory powder, 120 mesh SiC and 325 mesh SiC according to the mass ratio of 3:3.5:3.5, pour the ZrN-SiAlON and SiC powder into the mixing tank, start the mixer until the ZrN-SiAlON and SiC are mixed Uniformity; Pour the prepared binder sucrose solution into the uniformly mixed granular material, and start the mixer again to stir for 2 hours until the powder and binder are evenly mixed. Pour the uniformly mixed materials into the tray, and then put the mixture into a 6mm×6mm×45mm sample mold, and shape it at a pressure of 5MPa for 30s. Put the molded sample into a cold isostatic press and keep it at 150MPa. Press for 90s. Finally, put the shaped strip sample into an oven for drying, set a specific drying temperature and time, and place the shaped sample under the condition of buried carbon at a specific temperature for heat treatment for 3 hours. ZrN-SiAlON-SiC-C multiphase refractory can be obtained. The maximum flexural strength of the multiphase refractory material is 4.32MPa, the apparent porosity is 45.79%, and the bulk density is 1.57g/cm 3.

[0027] Example 3

[0028] Choose 200 mesh bauxite (from Yangquan, Shanxi, the main chemical composition is Al 2 O 3 , 62.70%; SiO 2 , 23.13%; Fe 2 O 3 , 7.38%; TiO 2 , 5.76%; others, 3.03%) and 200 mesh zircon (the main chemical composition is ZrO 2 , 69.11%; SiO 2 , 21.17%; HfO 2 , 3.00%; TiO 2 , 2.13%; Al 2 O 3 , 2.06%; others, 2.53%) as raw materials, coke (purchased from China New Times Co., Ltd., carbon content of 83.72wt.%, particle size of 200 mesh) as reducing agent, mixed according to the mass ratio of 7:3:2.42 The raw materials are mixed by dry ball milling and passed through a 200-mesh sieve. The powder is then placed in a corundum crucible and placed in a vacuum atmosphere furnace. Nitrogen is introduced at a flow rate of 0.3 to 0.5 L/min. The temperature is maintained at 1600°C for 4 hours. Nitriding synthesis of ZrN-SiAlON refractory powder. Weigh the synthesized ZrN-SiAlON refractory powder, 120 mesh SiC and 325 mesh SiC according to the mass ratio of 4:3:3, pour the ZrN-SiAlON and SiC powder into the mixing tank, start the mixer until the ZrN-SiAlON and SiC are mixed Uniformity; Pour the prepared binder sucrose solution into the uniformly mixed granular material, and start the mixer again to mix for 2 hours until the powder and binder are evenly mixed. Pour the uniformly mixed materials into the tray, and then put the mixture into a 6mm×6mm×45mm sample mold, and shape it at a pressure of 5MPa for 30s. Put the molded sample into a cold isostatic press and keep it at 150MPa. Press for 90s. Finally, put the shaped strip sample into an oven for drying, set a specific drying temperature and time, and place the shaped sample under the condition of buried carbon at a specific temperature for heat treatment for 3 hours. ZrN-SiAlON-SiC-C multiphase refractory can be obtained. The maximum flexural strength of the multiphase refractory material is 4.39MPa, the apparent porosity is 53.23%, and the bulk density is 1.36g/cm 3.