Method for producing high-purity electro-melting yttrium oxide sand

Abstract

The invention relates to a production method for high-purity fused yttria sand, using of high-purity Y2O3 raw material with Y2O3 content no less than 99.99%as melting material. The raw material goes through the high-temperature electric arc melting no less than 2400 DEG C; the control electrode does not contact the liquid level and is no more than 2cm above the liquid level; after the high-temperature electric arc melting, the raw material forms low-carbon white transparent crystal-like frit which forms sand of particle size after being broken up. The invention adopts the electric melting method to make the white powder yttria into crystal-like product. And the method has the advantages that a long electric arc operation avoids the contact of the electrode and yttria and the introduction of carbon; the produced yttria has high purity with Y2O3content no less than 99.8%, low blowhole rate, high volume density, high temperature strength and higher degree of wear-resistance and good volume stability; the method beneficial to obtain non-polluted titanium pieces can be applied in the casting of titanium alloy and reducesthe production cost of the titanium casting, laying the foundation for the promotion of the development of the titanium casting industry; also, the method can produce yttria product with high purityto meet various application purposes.

Description

technical field [0001] The invention belongs to a production method of refractory materials, in particular to an electric melting production method of yttrium oxide raw material. Background technique [0002] In recent years, my country's economic construction has advanced by leaps and bounds, and remarkable achievements have been made. The economic take-off has greatly promoted the rapid development of my country's iron and steel, non-ferrous metals, machinery, casting, aviation, chemicals, refractories and other industries. The era of precision materials pursuing high-quality and high-tech content has arrived. As these industries, the foundry industry, aviation industry, chemical industry, and refractory industry are also changing with each passing day. Due to its superior physical and chemical properties, titanium metal has been rapidly developed in the aerospace and foundry industries. Main features: low density, high mechanical strength, easy processing, titanium hig...

AI Technical Summary

Problems solved by technology

[0009] At present, the main technical status in China: sintering dense crystalline yttrium oxide, molding rare earth yttrium oxide into blanks or directly putting it into a sagger and putting it into a high-temperature kiln for sintering, the sintering temperature is ≥1580°C, and the heat preservation is ≥10 hours; High ≥ 3%, high impurity content ≥ 0.5%, high cost