Preparation method of sintered compact high-zirconium brick

Abstract

The invention discloses a sintered compact high-zirconium brick and a preparation method thereof. The method comprises the steps of pulping, spray granulation, isostatic compaction and high-temperature sintering, according to the preparation method, micron-sized Y2O3 with monoclinic zirconium oxide with the proportion of 40-70% is mainly used for stabilizing an electric melting zirconium oxide raw material, and 1-5% of nano-sized SiO2 is introduced; according to the method, a uniform structure in which zirconium oxide is uniformly dispersed in a small amount of glass phase is obtained, the prepared sintered compact high-zirconium brick has the characteristics of low porosity, high strength, good erosion resistance and low production cost, and large-size products can be prepared.

Description

technical field [0001] The invention generally relates to a refractory material and a preparation method thereof, in particular to a preparation method of a sintered dense high-zirconium brick. Background technique [0002] Glass or glass fiber melting furnace is a thermal equipment that melts various glass and glass fiber raw materials into uniform glass liquid at high temperature. The heat source generally adopts one or two of electrode heating or burner heating; glass melting furnace directly contacts Glass molten glass requires high investment and continuous operation. The glass melting furnace is directly related to the quality and production cost of glass and glass fiber products; The quality of molten glass and its molded products, and the service life of the glass melting furnace are also related to the production cost of glass and glass fiber products; High strength, corrosion resistance, low thermal conductivity and other characteristics; in addition, in view of t...

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Problems solved by technology

The existing sintered zirconia product preparation technology is relatively mature, but it cannot be applied in glass kilns, especially electronic glass kilns; the reasons are as follows: (1) In order to minimize the phase change in the firing process Volume effect, the existing sintered zirconia products contain at least 70% or even all of the cubic phase, but the thermal expansion coefficient of the cubic phase is relatively large, and when there is a temperature gradient, a large thermal stress will be generated inside the product. Therefore, it is difficult to realize Large-scale production and the thermal shock stability of the product are extremely poor; (2) A large amount of stabilizer will react with the components in the glass melt to form new substances during long-term use, resulting in the "desolvation" of the stabilizer (stabilizer from zirconia crystal lattice), and the stable cubic zirconia phase transforms into monoclinic phase after precipitating, accompanied by the subsequent volume effect; (3) the existing sintered zirconia products contain a certain proportion The above granular materials, once such particles enter the molten glass during long-term use, will seriously affect the quality of the molten glass; (4) The existing sintered zirconia products have high porosity and low strength and cannot resist the penetration of the molten glass. erosion and erosion

[0005] The zirconia in the existing fused high-zirconia bricks is basically monoclinic phase, thus avoiding the problems of "desolvation" of the stabilizer during use and poor thermal shock stability; the fused high-zirconia bricks introduce 10% Above SiO 2 , during electrofusion, SiO 2 It exists in a glassy state, and the glassy state can buffer the volume effect when the monoclinic phase changes and reduce the probability of cracks, thus realizing the large-scale preparation of fused high-zirconium bricks; Limit, the glass phase content in the fused high zirconium brick is more, and in the process of melt cooling, the density, glass phase distribution and grain size of different parts of the product have certain differences, which may cause glass phase in use. Defects such as phase precipitation and calculus; Considering the manufacturing cost, the electrofusion preparation process has a low output rate, a long process cycle, and a large consumption of molding sand and other consumables, resulting in an expensive product

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