Method for preparing light periclase-magnesium aluminate spinel composite material in in-situ decomposition manner

Abstract

The invention relates to a method for preparing a light periclase-magnesium aluminate spinel composite material in an in-situ decomposition manner. The technical scheme is as follows: firstly 85wt% to 98wt% of magnesium-aluminum hydrotalcite, 2wt% to 12wt% of water and 0 to 4wt% of binding agent are mixed, uniformly stirred and then molded; then a molded green body is dried for 4h to 24h under the condition of 110DEG C, thermally insulated for 1-8h under the condition of 1000DEG C to 1800DEG C and then cooled to obtain the light periclase-magnesium aluminate spinel composite material, wherein the granularity of the magnesium-aluminum hydrotalcite is less than or equal to 0.5mm, and the content of Mg(4-6)Al2(OH)(12-16)(CO3).4H2O is more than or equal to 90 percent by weight. The preparation process is simple. By adopting the method, the light periclase-magnesium aluminate spinel composite material with a uniform organization structure can be obtained. The prepared composite material has the characteristics of small volume density, high strength, excellent corrosion resistance, good high-temperature volume stability and excellent thermal-shock stability, can be used as a raw material for producing high-temperature ceramics and fire-resistant materials and can also be used as a light excellent fire-resistant material.

Description

technical field [0001] The invention belongs to the technical field of lightweight periclase-magnesium aluminum spinel composite materials, and in particular relates to a method for in-situ decomposition and preparation of lightweight periclase-magnesium aluminum spinel composite materials. Background technique [0002] With the increasing shortage of energy, countries pay more and more attention to the development, production and use of energy-saving materials for high-temperature industry. Due to the characteristics of light weight, high porosity, low bulk density and low thermal conductivity, lightweight refractory materials have obvious advantages in energy saving, so they have been widely used in high-temperature industries, playing the role of heat preservation, energy saving and consumption reduction. [0003] The main chemical components of the existing lightweight refractory materials are alumina and silica, which belong to the traditional aluminum-silicon series ma...

AI Technical Summary

Problems solved by technology

Although this type of synthesis method has its advantages, such as the main mineral phase periclase and magnesia-alumina spinel, which have excellent refractoriness and strong corrosion resistance to alkaline substances, there are also obvious shortcomings, that is, the preparation of light periclase- The process of magnesia-alumina spinel refractories is relatively complicated, such as many types of raw materials, long mixing time, and high performance requirements for mixing equipment. At the same time, it is difficult to make all kinds of raw materials uniformly distributed in the mixture The relevant reactions are not fully carried out. After high-temperature firing, it is difficult to obtain a lightweight material with uniform microstructure and chemical composition, which fails to meet the original intention of the material designer, resulting in unstable physical properties of the material, heat preservation and heat insulation. The effect is difficult to meet the needs of high temperature industry