Preparation method of high-purity zirconia refractory product

Abstract

The invention belongs to the field of refractory materials and provides a preparation method of a high-purity zirconia refractory product. The preparation method is characterized by adopting the pouring process in which the substrates are separated from the aggregates, infiltrating slurry (substrates) into the gaps of particles (aggregates) uniformly under negative pressure and the vibration environment by reasonably selecting grain gradation of the raw particles, precisely grasping the fluidity and solid content of the slurry and utilizing the crosslinking principle of acrylamide polymerization, forming zirconia bodies with uniform structures after curing the slurry (substrates) and obtaining the high-purity zirconia product after proper thermal treatment process. The method has the advantages of wide application range, simple operation, high product purity, zero limitation by the shape and size of the product, etc.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a preparation method of high-purity zirconia refractory products. Background technique [0002] Zirconia is an important refractory raw material with a true density of 5.68g / cm 3 , the melting point is as high as 2715°C, and the physical and chemical properties are excellent. High-purity zirconia refractory products usually refer to refractory products with a zirconia (including stabilizer) content of more than 98%. It uses zirconia particles or zirconia hollow balls, zirconia fine powder, stabilizers, binders, etc. as raw materials. Refractory products of desired shape are prepared by various molding means. High-purity zirconia refractory has the advantages of high service temperature (maximum service temperature 2300-2400 ℃), corrosion resistance, erosion resistance, not easy to decompose at high temperature, and good chemical stability. It is a high-performance refra...

AI Technical Summary

Problems solved by technology

Fusion casting method mainly produces fused AZS bricks with low zirconia content (Al 2 o 3 -ZrO 2 -SiO 2 bricks); the machine pressing method can produce high-purity zirconia products, but it has great limitations on the size and shape of the products, and can only produce products with small sizes and simple shapes; although the isostatic pressing method can produce products with large sizes, Products with complex shapes, but the isostatic press is expensive and the production process is relatively complicated; the ramming method has disadvantages such as poor product structure uniformity and difficulty in distributing small-sized parts; the pouring method has simple process operation and strong adaptability to product shape and size and many other advantages

The traditional pouring method is to mix granular materials, fine powder, water, etc. and then pour them into the mold for vibration casting. Due to the high density of zirconia, it is easy to cause segregation of the granular materials during the vibration casting process, and the structure uniformity of the prepared materials is poor.

Moreover, the traditional casting process mostly uses cement as a binder, and the prepared refractory products still have a large amount of Al after high-temperature firing. 2 o 3 , SiO 2 、K 2 O, Na 2 O and other components remain, which seriously reduces the purity and high-temperature performance of the product