A high-performance low-expansion crucible and a preparing method thereof

Abstract

A high-performance low-expansion crucible and a preparing method thereof are disclosed. The crucible is formed by a crucible base material and a crucible coating material. The crucible base material comprises, by mass, 40-60% of petalite, 5-15% of spodumene, 5-15% of Suzhou kaolin, 1-3% of purple mujie clay, 1-5% of black talc, 10-25% of Guizhou soil, 0-3% of white carbon black and 5-10% of zirconia micro powder. The crucible coating material comprises 0-15% of petalite, 85-100% of functional material micro powder, 0.1-0.5% of an additive dispersant and 0.1-0.5% of an adhesive. A finished product of the crucible is prepared by mixing materials, ball milling, sieving, filter pressing to remove water, vacuum pugging, forming, drying to obtain a crucible blank, spraying the inner surface of the crucible blank with the crucible coating material and finally firing. The crucible is low in production cost and good in forming performance, effectively improves thermal shock resistance and mechanical strength of a product and effectively prolongs the service lifetime, thus facilitating technical progress and application development of the crucible industry.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a high-performance low-expansion crucible and a preparation method thereof. Background technique [0002] Ceramic crucible is an important part of refractory materials. It is a container for melting and calcination, solid-liquid heating and reaction. [0003] Crucible production raw materials can be summarized into three types. One is crystalline natural graphite, the other is alumina crucible, and the third is quartz crucible. At present, the crucibles used for calcining hydroxides to obtain high-purity oxides are generally quartz crucibles. Because quartz crucibles are cheap and easy to obtain, they are widely used. However, quartz crucible has fatal flaws, such as short service life and instability. Quartz has crystal transformation at 573°C, accompanied by volume expansion, so it is easy to cause peeling and bursting, low frequency of use, and even quartz parti...

AI Technical Summary

Problems solved by technology

However, the quartz crucible has fatal flaws, such as short service life and instability. Quartz has a crystal transformation at 573°C, accompanied by volume expansion, so it is easy to cause peeling and bursting, low frequency of use, and even quartz particles contaminate calcined products.

In addition, the crucibles used in the production of products with special materials, such as the crucibles of niobium and tantalum companies that produce niobium and tantalum, are very heavy, labor-intensive, and expensive, which increases the burden on enterprises.

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