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

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...

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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 is necessary to develop cordierite that can be sintered at low temperature. Bluestone-based glass-ceramic binder to improve the performance of silicon carbide ceramic materials

So far, there have been no reports of cordierite-based glass-ceramic binders for low-temperature sintering of silicon carbide

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