Barium zirconate/magnesium oxide composite ceramic material and preparation method thereof

Abstract

The invention relates to a barium zirconate/magnesium oxide composite ceramic material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: mixing a barium source and a zirconium source, carrying out dry ball milling, carrying out heat preservation at 1200-1500 DEG C, carrying out furnace cooling, and crushing to obtain pre-sintered barium zirconate powder; mixing the pre-sintered barium zirconate powder and the fused magnesia fine powder to obtain a mixture I; and mixing the fused magnesite particles I and the fused magnesite particles II to obtain a mixture II. And mixing the mixture I and the mixture II to obtain the barium zirconate/magnesium oxide composite ceramic powder. And carrying out mechanical pressing, heating the barium zirconate/magnesium oxide composite ceramic green body to 1500-1600 DEG C under the conditions of air atmosphere and normal pressure, and carrying out heat preservation for 3-5 hours to obtain the barium zirconate/magnesium oxide composite ceramic material. The preparation method is simple in process, short in production period, low in cost and environment-friendly, and the prepared barium zirconate/magnesium oxide composite ceramic material is high in normal-temperature compression strength and low in normal-temperature heat conductivity coefficient.

Description

technical field [0001] The invention belongs to the technical field of composite ceramic materials. In particular, it relates to a barium zirconate / magnesia composite ceramic material and a preparation method thereof. Background technique [0002] Barium zirconate has a small coefficient of thermal expansion (8.7×10 -6 ℃ -1 , 25~1080℃), lower thermal conductivity, higher melting point (2700℃), lower chemical reaction activation energy, good thermal shock resistance and excellent corrosion resistance compared to magnesium oxide, but The production cost of barium zirconate is high, and the sintering of larger volume products is prone to cracking. [0003] Magnesia (MgO) has a high melting point (~2800°C), high thermal conductivity [~60W / (m·K) at 25°C and 13W / (m·K) at 1000°C], excellent chemical stability, good Excellent properties such as corrosion resistance and high-load fire resistance, but the ceramic has low strength, low toughness, and thermal expansion coefficient (...

AI Technical Summary

Problems solved by technology

However, the preparation process is complex, the preparation cycle is long, and the cost is high

In addition, the magnesium salt solution chooses magnesium nitrate solution, magnesium sulfate solution, etc., which will cause air pollution during the production process and is not environmentally friendly.

At the same time, the composite material has a large thermal conductivity at room temperature, which is easy to cause heat loss

[0005] "Aluminum-spinel-magnesia composite refractory material and its preparation method and application" (CN201210104103.3[P]) patented technology, the technology disclosed A kind of use magnesia, magnesium-rich aluminum spinel or magnesium aluminum spinel and metal aluminum powder as raw materials to prepare aluminum-spinel-magnesia composite refractory material; during the preparation process, low-temperature heat treatment and introduction of aluminum powder improve the anti-slag penetration performance, However, the normal temperature mechanical properties of the composite material are not high, and the normal temperature compressive strength is 48-69MPa; the introduced aluminum powder is prone to volume effect and cracking at high temperature