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

A zrn-sialon-sic-c, refractory technology, applied in the field of refractories, can solve the problems of high energy consumption, high cost, high price, etc., and achieve the effect of high performance, low energy consumption and low cost

Inactive Publication Date: 2018-11-23
CHINA UNIV OF GEOSCIENCES (BEIJING)
2 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the ZrO-containing 2 , ZrN, ZrC and other multi-phase high-temperature resistant materials are expensive, and are only used in extreme high-temperature and harsh conditions such as aerospace, high-temperature industrial key components, etc.
In refractory materials, ZrO is only used in parts such as slide plate holes and sizing nozzles. 2 Materials, there are not many reports about the application of ZrN, ZrC, etc. in high-performance refractory materials, mainly due to the high price and difficulty in preparation.
[0004] In addition, non-oxide phases such as ZrN and SiAlON need to be prepared at very...
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Abstract

The invention relates to a preparation method of a ZrN-SiAlON-SiC-C complex-phase fireproof material, and belongs to the field of fireproof materials. Bauxite and zirconite are served as raw materialsto prepare ZrN-SiAlON fireproof powder, a sugarcane solution is served as a binding agent to combine 120-mesh SiC and 325-mesh SiC, the material is formed and subjected to thermal treatment at the temperature of 1500 DEG C to prepare the ZrN-SiAlON-SiC-C fireproof material. When the mass ratio of the ZrN-SiAlON fireproof powder to 120-mesh SiC to 325-mesh SiC is 2 to 4 to 4, the breaking strengthof the fireproof material is 3.53 MPa, the apparent porosity is 41.10%, and the volume density is 1.76g/cm<3>. When the mass ratio is 3 to 3.5 to 3.5, the breaking strength of the fireproof materialis 4.32 MPa, the apparent porosity is 45.79%, and the volume density is 1.57g/cm<3>. When the mass ratio is 4 to 2 to 2, the breaking strength of the fireproof material is 4.39 MPa, the apparent porosity is 53.23%, and the volume density is 1.36g/cm<3>. When the mass ratio is 4 to 2 to 2, the breaking strength of the fireproof material is 4.25 MPa, the apparent porosity is 50.61%, and the volume density is 1.41g/cm<3>. The preparation technology related to the invention can be an effective high-technology and low-cost route to prepare high-performance ZrN-SiAlON-SiC-C fireproof material products.

Technology Topic

AluminiumThermal treatment +8

Image

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

Examples

  • Experimental program(4)

Example Embodiment

[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.

Example Embodiment

[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.

Example Embodiment

[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.

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