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Method for microwave sintering of sialon ceramic material

A microwave sintering, ceramic material technology, applied in sustainable manufacturing/processing, climate sustainability, chemical industry, etc., can solve the problems of high energy consumption, low efficiency restrictions, etc., to reduce the sintering densification temperature and prevent crack propagation , the effect of improving the shrinkage rate

Active Publication Date: 2020-09-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the methods of preparing sialon ceramics are mainly sintering methods such as pressureless, hot pressing, hot isostatic pressing, and spark plasma sintering, but due to the high energy consumption and low efficiency of traditional sintering methods (pressureless, hot pressing, hot isostatic pressing) Limits the performance optimization and large-scale production of ceramic cutting tools
In addition, in the pressure sintering method (hot pressing, hot isostatic pressing, discharge plasma), due to the limitation of the pressing process in the sintering process, only ceramic samples with simple shapes can be prepared.

Method used

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  • Method for microwave sintering of sialon ceramic material
  • Method for microwave sintering of sialon ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A sialon ceramic material and its microwave sintering process, specifically: proportioning by mass fraction, silicon nitride 72.37wt.%, aluminum nitride 6.98wt.%, aluminum oxide 17.65wt.%, while adding a suitable sintering aid Combination, the mass percentage of each sintering aid is as follows: yttrium oxide 3wt.%, mix the prepared raw material powder, use industrial absolute ethanol and corundum balls as the mixing medium, and pass the mixed raw material powder through a planetary ball mill for 24 hours, and add PVA 2 hours before taking it out. Vacuum drying is carried out after the ball milling, the drying temperature is 110°C, the dry powder is sieved and granulated through a 100-mesh sieve, the interior of the cemented carbide mold is coated with oil, and then the sieved powder is filled into the mold, and the graphite Apply a pressure of 200 MPa to the mold, hold the pressure for 2 minutes, cold press and demould. The samples after demoulding were put into the i...

Embodiment 2

[0047] A sialon ceramic material and its microwave sintering process, specifically: proportioning by mass fraction, silicon nitride 70.12wt.%, aluminum nitride 6.77wt.%, aluminum oxide 17.11wt.%, while adding a suitable sintering aid Combination, the mass percentage of each sintering aid is as follows: 5wt.% of yttrium oxide, 1wt.% of samarium oxide, mix the prepared raw material powder, use industrial absolute ethanol and corundum balls as the mixing medium, and mix the mixed raw material powder The bodies were ball milled in a planetary ball mill for 24 hours, and PVA was added 2 hours before removal. Vacuum drying is carried out after the ball milling, the drying temperature is 110°C, the dry powder is sieved and granulated through a 100-mesh sieve, the interior of the cemented carbide mold is coated with oil, and then the sieved powder is filled into the mold, and the graphite Apply a pressure of 200 MPa to the mold, hold the pressure for 2 minutes, cold press and demould....

Embodiment 3

[0049] A sialon ceramic material and its microwave sintering process, specifically: proportioning by mass fraction, silicon nitride 68.63wt.%, aluminum nitride 6.63wt.%, aluminum oxide 16.74wt.%, while adding a suitable sintering aid Combination, the mass percentage of each sintering aid is as follows: 7wt.% of yttrium oxide, 1wt.% of magnesium oxide, mix the prepared raw material powder, use industrial absolute ethanol and corundum ball as the mixing medium, and mix the mixed raw material powder The bodies were ball milled in a planetary ball mill for 24 hours, and PVA was added 2 hours before removal. Vacuum drying is carried out after the ball milling, the drying temperature is 110°C, the dry powder is sieved and granulated through a 100-mesh sieve, the interior of the cemented carbide mold is coated with oil, and then the sieved powder is filled into the mold, and the graphite Apply a pressure of 200 MPa to the mold, hold the pressure for 2 minutes, cold press and demould....

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Abstract

The invention belongs to the field of material preparation, and particularly relates to a method for microwave sintering of a sialon ceramic material. Micro-nanoscale silicon nitride powder, aluminumnitride powder and aluminum oxide powder are adopted as the raw materials, several of yttrium oxide, ytterbium oxide, magnesium oxide, magnesium silicon nitride and samarium oxide are arbitrarily selected as the sintering aid, and microwave sintering is conducted to obtain the sialon ceramic material. According to the method, micro-nanoscale silicon nitride powder, aluminum nitride powder and aluminum oxide powder are subjected to atom replacement in the microwave sintering process, and the sintering aid is added to synthesize a required phase, so that the sintering densification temperature can be effectively reduced, the production efficiency can be improved while the microstructure of the material is more uniform, and the integration of the phase synthesis and densification process is realized. The prepared ceramic material has high hardness and good fracture toughness on the basis of guaranteeing basic complete compactness, the actual density is 3.233g / cm<3>, the Vickers hardness is 14.3GPa, and the fracture toughness is 7.28MPa.m<1 / 2>.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a method for microwave sintering of Sialon ceramic materials. Background technique [0002] Sialon ceramics is a solid solution of Si3N4 and Al2O3 discovered by Japanese scholars and British Jack and Wilson in the study of Si3N4-Al2O3 system in the early 1970s. They found that 60% to 70% of Al2O3 is solid-dissolved into the lattice of β-Si3N4, that is, the Si atoms and N atoms in Si3N4 are partially covered by Al or (Al+M) (where M is a metal ion such as Mg2+, Ca2+, Rare earth ions such as Li+ and La3+) and O atoms are replaced, thus effectively promoting the sintering of silicon nitride and forming Sialon ceramics. Sialon ceramics combine the excellent physical and mechanical properties of Si3N4 and Al2O3. Its hardness, wear resistance, high strength and toughness, low thermal expansion coefficient, thermal shock resistance and oxidation resistance are comparable...

Claims

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Application Information

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IPC IPC(8): C04B35/599C04B35/622C04B35/638C04B35/64
CPCC04B35/597C04B35/622C04B35/638C04B35/64C04B2235/3873C04B2235/3865C04B2235/3852C04B2235/3224C04B2235/3225C04B2235/3217C04B2235/3206C04B2235/5445C04B2235/5454C04B2235/6581C04B2235/6562C04B2235/6567C04B2235/667C04B2235/77C04B2235/96Y02P20/10
Inventor 袁军堂彭皓辉殷增斌
Owner NANJING UNIV OF SCI & TECH
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