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Preparation method of molybdenum and molybdenum alloy surface anti-oxidation coat

An anti-oxidation and molybdenum alloy technology is applied in the field of preparation of anti-oxidation coatings on the surface of molybdenum and molybdenum alloys, which can solve the problems of high equipment requirements, complex process and high cost, achieves wide source of raw materials, simple preparation method, and prevents oxidation Effect

Inactive Publication Date: 2011-03-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods are complex in process, high in equipment requirements, and long in cycle, which leads to an increase in cost and is not suitable for industrial applications.
The invention patent of Zhang Cunmo, Song Xiulan, etc. "Molybdenum or molybdenum alloy anti-oxidation coating method and its products" (CN86103384A), although the process is relatively simple, but due to the high-temperature diffusion treatment in vacuum, the requirements for equipment are relatively high, and the cost is high. higher

Method used

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  • Preparation method of molybdenum and molybdenum alloy surface anti-oxidation coat
  • Preparation method of molybdenum and molybdenum alloy surface anti-oxidation coat
  • Preparation method of molybdenum and molybdenum alloy surface anti-oxidation coat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of matrix

[0026] Wash the molybdenum rod with weak alkali, weak acid, water and dry to remove the dirt, grease, oxide layer and impurities on the surface of the substrate. The binding force of the matrix;

[0027] (2) Preparation and coating of paint

[0028] (a) barium silicate glass frit (mass percentage is SiO 2 : 37%; BaO: 45%; B 2 o 3 : 6%; ZnO: 5%; CaO: 5%; Al 2 o 3 : 2%;) mix evenly, and then smelt at 1450°C for 2h to 4h, as long as it is melted, quickly water-cool the high-temperature glass melt, and after ball milling for 72h, pass through a 200-mesh sieve to form the base glaze;

[0029] (b) with ZrO 2 It is a refractory filler in molybdenum glaze, and the ratio of molybdenum glaze is base glaze: ZrO 2 : Clay is 14:2:1.

[0030] (c) Mix terpineol and ethyl cellulose in a mass ratio of 100:1.5 in a water bath (50-70°C, 8-10h) to obtain varnish;

[0031] (d) Stir the molybdenum glaze and varnish in a magnetic stirrer in a ratio of 2:1...

Embodiment 2

[0036] (1) Preparation of matrix

[0037] Same as embodiment 1.

[0038] (2) Preparation and coating of paint

[0039] (a) Same as Example 1.

[0040] (b) with ZrO 2 It is a refractory filler in molybdenum glaze, and the ratio of molybdenum glaze is base glaze: ZrO 2 : Clay is 14:3:1.

[0041] (c), (d) and (e) are the same as in Example 1. The test method is the same as in Example 1.

[0042] The weight loss of the bare molybdenum substrate reaches 180mg / cm at 1000°C in 30 minutes 2 , while the weight loss of the substrate protected by the coating in this test is only 16.34mg / cm 2 . After the coated molybdenum substrate was pre-fired at 1000°C for 2 hours, the coating on the surface was peeled off and the energy spectrum (EDS) analysis was performed on the substrate. The oxygen content was only about 6.3% of the oxygen content without coating, and the anti-oxidation effect was remarkable. .

Embodiment 3

[0044] (1) Preparation of matrix

[0045] Same as embodiment 1.

[0046] (2) Preparation and coating of paint

[0047] (a) Same as Example 1.

[0048] (b) with ZrO 2 It is a refractory filler in molybdenum glaze, and the ratio of molybdenum glaze is base glaze: ZrO 2 : Clay is 14:6:1.

[0049] (c), (d) and (e) are the same as in Example 1. The test method is the same as in Example 1.

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Abstract

The invention relates to a preparation method of molybdenum of zirconium matrix and molybdenum alloy surface anti-oxidation coat, comprising the following steps of: (1) weak base washing, weak acid washing, water washing and drying molybdenum rod, and texturing the surface of the molybdenum rod by means of sand spraying; and (2) (a) evenly mixing barium silicate glass materials, smelting at 1350-1480 DEG C for 2-4 hours, water cooling, ball milling and screening with 200 screen meshes to be taken as base glaze; (b) preparing molybdenum glaze by taking ZrO2 as refractory filling material in the molybdenum glaze; (c) preparing varnish with organic solvent terpineol and clay; (d) stirring the molybdenum glaze and the varnish to prepare coat glaze pulp; and (e) coating the coat glaze pulp, drying, dipping the coat glaze pulp with alkali-free glass cloth and packing at the surface with a coated dope glaze pulp layer, and drying. The method is simple, has low cost, and can effectively prevent the oxidization of molybdenum electrodes in the process of kilning.

Description

technical field [0001] The invention belongs to the field of preparation of anti-oxidation coatings on molybdenum and molybdenum alloy surfaces, and in particular relates to a method for preparing an anti-oxidation coating on the surface of molybdenum and molybdenum alloys with a zirconia matrix. Background technique [0002] Molybdenum has a high melting point, good electrical and thermal conductivity, good high temperature strength, and still has high mechanical strength and high corrosion resistance at around 1700 °C. These properties make molybdenum widely used as an electrode material in the glass melting industry. However, molybdenum electrodes are easily oxidized, and molybdenum will slowly oxidize at 300°C to form MoO 2 , when the temperature rises to 600°C, the molybdenum undergoes secondary oxidation to form MoO 3 , easily sublimated and volatilized. Coat the surface of the molybdenum electrode with a relatively thin layer of coating material to eliminate the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23D5/02
Inventor 汪庆卫宁伟关志峰罗理达陈健王智勇
Owner DONGHUA UNIV
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