Cordierite-based glass ceramic combined silicon carbide ceramic material and preparation method thereof

A technology of silicon carbide ceramics and glass-ceramics, applied in the field of ceramic materials, can solve the problems of reducing liquid phase, unfavorable liquid phase sintering, and no silicon carbide, and can reduce the sintering temperature, which is beneficial to popularization and application and industrial technology, and improves the The effect of chemical compatibility

Active Publication Date: 2021-08-20
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, domestic and foreign scholars report sintering at a relatively high temperature range. Since cordierite crystals have been precipitated during the heating process, the content of the liquid phase has been reduced, which is not conducive to liquid phase sintering. Therefore, it i

Method used

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  • Cordierite-based glass ceramic combined silicon carbide ceramic material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0022] Example 1:

[0023] 1, the present embodiment of a cordierite based crystallized glass bonded silicon carbide ceramic material, comprising a base material and a binding agent, composed of cordierite base material is a microcrystalline glass powder (particle size 75μm) 30wt%, silicon carbide oxidation pretreatment aggregate 70wt% (aggregate of silicon carbide oxidation treatment at a temperature of 1000 ℃ 2h prepared, wherein the particle size of 30 mesh 30wt%, particle size 80 mesh 10wt%, a particle size of 120 10wt%, particle size of 325 mesh 20wt%). Wherein the glass powder composition of cordierite crystallites group of MgO 17wt%, Al 2 O 3 22 wt%, SiO 2 60 wt%, Li 2 O 1wt%. Binding agent concentration of 5wt% PVA solution in an amount of 8wt% binder.

[0024] 2, for example, cordierite glass-ceramics of silicon carbide ceramic material prepared with the present embodiment, the following steps:

[0025] (1) After the above ratio were mixed according to the composition of ...

Example Embodiment

[0028] Example 2:

[0029] 1, the present embodiment of a cordierite based crystallized glass bonded silicon carbide ceramic material, comprising a base material and a binding agent, composed of cordierite base material is a microcrystalline glass powder (particle size 35μm) 20wt%, silicon carbide oxidation pretreatment aggregate 80wt% (aggregate of silicon carbide oxidation treatment at a temperature of 1100 ℃ 1h prepared, wherein the particle size of 30 mesh 40wt%, particle size 50 mesh 10wt%, 200 object size 10wt%, particle size of 325 mesh 20wt%). Wherein the glass powder composition of cordierite crystallites group of MgO 15wt%, Al 2 O 3 25 wt%, SiO 2 57 wt%, Li 2 O 3wt%. Binding agent concentration of 5wt% PVA solution in an amount of 12wt% binder.

[0030] 2, for example, cordierite glass-ceramics of silicon carbide ceramic material prepared with the present embodiment, the following steps:

[0031] (1) After the above ratio were mixed according to the composition of cordie...

Example Embodiment

[0034] Example 3:

[0035] 1, the present embodiment of a cordierite based crystallized glass bonded silicon carbide ceramic material, comprising a base material and a binding agent, composed of cordierite base material is a microcrystalline glass powder (particle size 10μm) 5wt%, silicon carbide oxidation pretreatment aggregate 95wt% (aggregate of silicon carbide oxidation treatment at a temperature of 1000 ℃ 2h prepared, wherein the particle size of 30 mesh 35wt%, a particle size of 60 mesh 10 wt%, a particle size of 120 10wt%, particle size of 325 mesh 40wt%). Wherein the glass powder composition of cordierite crystallites group of MgO 18wt%, Al 2 O 3 25 wt%, SiO 2 56 wt%, Li 2 O 1wt%. Binding agent concentration of 5wt% PVA solution in an amount of 10wt% binder.

[0036] 2, for example, cordierite glass-ceramics of silicon carbide ceramic material prepared with the present embodiment, the following steps:

[0037] (1) After the above ratio were mixed according to the compositi...

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Abstract

The invention discloses a cordierite-based glass ceramic combined silicon carbide ceramic material, which comprises a base material and a binding agent, wherein the base material comprises 10-30 wt% of cordierite-based glass ceramic powder and 70-90 wt% of oxidation pretreatment silicon carbide aggregate, the cordierite-based glass ceramicpowder is prepared from the following components in percentage by weight: 15-22 wt% of MgO, 20-25 wt%of Al2O3, 56-60 wt%of SiO2 and 1-3 wt% of Li2O, the oxidation pretreatment silicon carbide aggregate is prepared by performing oxidation treatment on silicon carbide aggregate at a temperature of 1000-1100 DEG C for 1-2 hours, and the use amount of the binding agent is 8-12wt% of the base material. The invention also discloses a preparation method of the cordierite-based glass ceramic combined silicon carbide ceramic material. According to the invention, cordierite-based glass ceramicis taken as a sintering aid, and cordierite crystals are added in a matrix in an in-situ synthesis manner, so that not only is a low-temperature sintering aid provided, but also the silicon carbide ceramic material with high density and low sintering temperature is obtained; and the method has important significance in improving the quality of the silicon carbide ceramic material and saving the product cost, and is beneficial to popularization and application progress and development of the industry technology.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a cordierite-based glass-ceramic bonded silicon carbide ceramic material and a preparation method thereof. Background technique [0002] Silicon carbide has excellent thermal shock resistance, thermal conductivity, mechanical properties and chemical stability, but silicon carbide is a covalent compound, which has the disadvantage of being difficult to sinter. It is difficult to sinter at low temperatures, and its sintering temperature is usually higher than 1800 ℃. In order to increase the density of silicon carbide and reduce its sintering temperature, it is a common method to add some binders that are easy to generate liquid phase. Currently commonly used binders are mullite, cordierite, alumina, etc. Among them, mullite and alumina have higher thermal expansion coefficients, and their addition inevitably increases the thermal expansion coefficient of the material, a...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B35/626C04B35/63
CPCC04B35/565C04B35/622C04B35/62605C04B35/6303C04B2235/36C04B2235/602C04B2235/606C04B2235/656C04B2235/6567
Inventor 劳新斌徐笑阳涂治江伟辉梁健吴倩虞澎澎苗立锋包镇红
Owner JINGDEZHEN CERAMIC INSTITUTE
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