Protective coating for inhibiting platinum bushing from being oxidized and volatilized, and manufacturing method and application thereof

A protective coating, oxidative volatilization technology, used in alkali metal silicate coatings, coatings, manufacturing tools, etc., can solve problems such as volatilization cannot be well protected, bushings cannot heal themselves, and platinum bushings cannot be protected. , to achieve the effect of enhancing air tightness and chemical stability, perfect matching of expansion coefficient, and short cycle.

Active Publication Date: 2011-02-09
CHONGQING POLYCOMP INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In terms of reducing the use loss of platinum slats, in the prior art reports, "Casting slat coating" contributed by Ma Mingjie provides an anti-oxidation coating formulated with alumina coating powder and an appropriate amount of binder. method, the protection effect of this method is relatively poor, the coating after high temperature sintering is very easy to crack, and the coating is easy to fall off during the pouring process, the cracked part of the bushing plate cannot heal itself during use, and the volatilization in some areas still cannot get better. protection of
[0004] In addition, the Chinese patent application CN101638294A discloses "a coating for reducing the use loss of platinum bushings and its preparation method", which is prepared from coating powder made of aluminum oxide, silicon oxide, and sodium oxide, Suzhou soil, and distilled water. The process cycle is long; the bushing plate after high temperature sintering will be slightly deformed; the sintered coating has low impact resistance and is easy to fall off during the later pouring process
[0005] Therefore, the existing protective coatings cannot really reduce the use loss of platinum, and cannot form a good protection for the platinum bushing

Method used

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  • Protective coating for inhibiting platinum bushing from being oxidized and volatilized, and manufacturing method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The making of embodiment 1 coating

[0039] A protective coating, the main raw materials of which are: 200g of silicon oxide, 450g of aluminum oxide, 50g of sodium silicate, 250g of sodium tetraborate, and 5g of thermoplastic phenolic resin as a binder.

[0040] The production process of the protective coating includes the following processes:

[0041] ①. Mix the main raw material components according to the ratio, and grind until all of them pass through the 200-mesh sieve;

[0042] 2. Add thermoplastic phenolic resin powder and water accounting for about 40% of the total weight to the ground material in step 1, stir and mix evenly, wherein the thermoplastic phenolic resin powder can all pass through a 200-mesh sieve;

[0043] ③. Heating step ② Mix the material until it reaches a temperature of about 120°C and keep stirring until it becomes viscous.

Embodiment 2

[0044] The making of embodiment 2 coating

[0045] A protective coating, the main raw materials of which are: 500g of silicon oxide, 200g of aluminum oxide, 150g of sodium silicate, 100g of sodium tetraborate, and 10g of thermoplastic phenolic resin.

[0046] The manufacturing process of this protective paint is the same as embodiment 1.

Embodiment 3

[0047] The making of embodiment 3 coating

[0048] A protective coating, the main raw materials of which are: 400g of silicon oxide, 350g of aluminum oxide, 80g of sodium silicate, 160g of sodium tetraborate, and 8g of thermoplastic phenolic resin.

[0049] The manufacturing process of this protective paint is the same as embodiment 1.

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Abstract

The invention discloses a protective coating for inhibiting a platinum bushing from being oxidized and volatilized and reducing the loss of noble metals, a preparation process and application. The protective coating mainly comprises the following components in percentage by weight: 20 to 50 percent of silicon oxide, 20 to 45 percent of aluminum oxide, 5 to 15 percent of sodium silicate and 10 to 25 percent of sodium tetraborate. The protective coating can prevent platinum and rhodium alloys from being oxidized and volatilized at high temperature effectively, and compared with the bushings which are not processed, the bushing which is processed by a coating process can reduce the loss amount by over 30 percent.

Description

technical field [0001] The invention relates to the field of glass fiber technology, in particular to a method for protecting bushings in the glass fiber industry, in particular to a protective coating for suppressing oxidation and volatilization on the surface of platinum bushings and reducing loss of precious metals, as well as its preparation process and application. Background technique [0002] Platinum rhodium has a high melting point, stable chemical properties, can withstand rapid cooling and heat, and has good processing and welding properties. The bushing plate made of platinum rhodium alloy is a standard material for the glass fiber industry. The operating temperature of the platinum-rhodium alloy bushing (platinum bushing for short) is between 1100°C and 1300°C, and the platinum on the outer surface is easily oxidized to PtO 2 , while PtO 2 It is in the form of a thin solid surface film at a lower temperature, which has a certain protective effect on the leakage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/04C09D7/12C03B37/08
Inventor 周冬运王鑫王流兴
Owner CHONGQING POLYCOMP INT
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