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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AI-Extracted Technical Summary

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...

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.

Technology Topic

CordieriteCarbide silicon +3

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Examples

Experimental program(4)

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 cordierite glass powder crystallites, incubated 2h electric furnace melted into molten glass, and the glass was poured into water for quenching a glass block obtained at a temperature of 1600 deg.] C, cordierite ceramics obtained by milling a glass frit;

[0026] (2) After the above mixing ratio in accordance with the base material, addition of binding agent are mixed uniformly, then press-molded at temperature 110 ℃ dried to give the green body (the kiln water <1%);

[0027] (3) The two-stage sintering the green body, i.e. for 4h at 850 ℃, then heated to 1050 deg.] C to precipitate crystals incubated 3h, then cooled to room temperature, i.e., to obtain cordierite glass-ceramic bonded silicon carbide ceramic material.

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 cordierite ceramics base glass frit, an electric furnace melted into the molten glass for 3h, then was poured into water for quenching the molten glass to obtain a glass piece at a temperature of 1600 deg.] C, cordierite ceramics obtained by milling a glass frit;

[0032] (2) After the above mixing ratio in accordance with the base material, addition of binding agent are mixed uniformly, then press-molded at temperature 110 ℃ dried to give the green body (the kiln water <1%);

[0033] (3) The two-stage sintering the green body, i.e., incubated at 900 ℃ for 5h, then heated to 1100 ℃ precipitate crystals incubated 3h, then cooled to room temperature, i.e., to obtain cordierite glass-ceramic bonded silicon carbide ceramic material.

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 composition of cordierite ceramics base glass frit, an electric furnace melted into the molten glass for 3h, then was poured into water for quenching the molten glass to obtain a glass piece at a temperature of 1550 deg.] C, cordierite ceramics obtained by milling a glass frit;

[0038](2) After the above mixing ratio in accordance with the base material, addition of binding agent are mixed uniformly, then press-molded at temperature 110 ℃ dried to give the green body (the kiln water <1%);

[0039] (3) The two-stage sintering the green body, i.e., incubated at 800 ℃ 5h, then heated to 1200 deg.] C to precipitate crystals incubated 2h, then cooled to room temperature, i.e., to obtain cordierite glass-ceramic bonded silicon carbide ceramic material.

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Classification and recommendation of technical efficacy words

Improve chemical compatibility
lower sintering temperature

Polymer modified bentonite and preparation process thereof

PendingCN113429624AImprove chemical compatibilityhigh viscosity

Owner:句容康泰膨润土有限公司

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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