Surface anti-oxidation protective coating of platinum wire-drawing crucible as well as preparation method and application of surface anti-oxidation protective coating

Abstract

The invention relates to a surface anti-oxidation protective coating of a platinum wire-drawing crucible as well as a preparation method and an application of the surface anti-oxidation protective coating. The protective coating comprises the following raw material components in percentage by weight: 20-35% of a-calcined aluminum oxide powder, 15-30% of quartz powder, 5-10% of boron nitride powder and 30-55% of kaolin. The protective coating disclosed by the invention has strong adhesion to the platinum wire-drawing crucible, and particularly has very high binding force after sintering treatment, so that the oxidizing volatilization loss of platinum under the condition at a high temperature can be effectively prevented, and the swelling deformation under the condition of conventional high-temperature sintering and the shrinkage deformation under the condition of rapid cooling after high-temperature power failure of the platinum crucible are effectively overcome.

Description

technical field [0001] The invention relates to a protective coating, in particular to an anti-oxidation protective coating on the surface of a platinum wire drawing crucible, a preparation method and application thereof. Background technique [0002] At present, platinum-rhodium alloy is a precious rare metal, and the reserves found in China are very low. With the vigorous development of a series of glass industries such as quartz fiber production, especially the emerging boron nitride fiber, zirconia fiber and other series With the development of the special fiber industry, its application volume is constantly doubling. Reducing the natural loss and high-temperature oxidation volatilization loss of platinum in daily production operations can not only save high costs for enterprises, but also realize the full utilization and protection of non-renewable resources for the country. The common operating temperature of the platinum-rhodium alloy wire drawing crucible is between...

AI Technical Summary

Problems solved by technology

[0003] In terms of reducing the use loss of platinum crucibles, the pretreatment process for platinum bushings in the "Protective Coating for Inhibiting Oxidation and Volatilization of Platinum Bushings" disclosed in the existing Chinese patent application CN101967313A still needs to be polished and coarsened for the parts to be painted. , it can be seen that the adhesion of the coating used is not very high, and the roughening of the surface of the platinum bushing will inevitably cause the artificial loss of the platinum-rhodium alloy

[0004] In addition, the Chinese patent application CN101638294A discloses "a coating for reducing the use loss of platinum bushings and its preparation method". Moreover, the thin layer of enamel formed on the surface of the plug plate is relatively fragile and has low impact resistance, and it is easy to peel off during the later installation and pouring process

[0005] Therefore, the current platinum surface protective coating cannot minimize the use loss of platinum, and it is still necessary to protect and improve the platinum surface under high temperature conditions.

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