Method for preparing antioxidant coating on surface of molybdenum and molybdenum alloy protection tube

A technology of anti-oxidation coating and protection tube, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of single composition, short service life, easy cracking of coating, etc., to improve deposition efficiency , optimize the structure, improve the effect of antioxidant properties

Pending Publication Date: 2020-12-29
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current coating obtained by embedding infiltration has a single composition, which still cannot solve the problems of easy cracking and short service life of the coating in a periodic oxidizing environment.

Method used

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  • Method for preparing antioxidant coating on surface of molybdenum and molybdenum alloy protection tube
  • Method for preparing antioxidant coating on surface of molybdenum and molybdenum alloy protection tube
  • Method for preparing antioxidant coating on surface of molybdenum and molybdenum alloy protection tube

Examples

Experimental program
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Embodiment 1

[0040] Example 1: Production of anti-oxidation molybdenum protective tubes for thermocouples of φ8×1×500mm

[0041] see figure 1 :

[0042] 1. Place the inner and outer surfaces of the molybdenum tube in a 5wt% NaOH solution, and ultrasonically clean it at room temperature for 20 minutes to remove surface oxides; then use alcohol and distilled water to ultrasonically clean the tube, and dry it in an oven at 80°C.

[0043] 2. Place a φ6×4mm molybdenum block at one end of the molybdenum tube, and use argon arc welding to weld the head. The welding current is 100A, and the argon gas flow rate is 15ml / min. After welding, the molybdenum tube with blind end is cleaned by repeating the method of step 1, dried for later use, and the oxide on the surface of the welded joint is cleaned to obtain the substrate to be infiltrated.

[0044] 3. Ti powder (weight), SiO 2 Powder (weight), NH 4 F (volume) is formulated according to 40:50:10, Ti powder needs 160.8g, SiO 2 Powder needs 201g,...

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Abstract

The invention relates to a method for preparing an antioxidant coating on the surface of a molybdenum and molybdenum alloy protection tube. According to the method, a titanium modified molybdenum silicide coating is prepared by using an embedding infiltration method, the relationship among dispersant type selection, embedding infiltration mixture quality and sample surface area is optimized, and the deposition efficiency is increased. The molybdenum and molybdenum alloy protection tube prepared by the method has no obvious weight loss after being continuously oxidized for 180 hours at the temperature of 1200 DEG C in a periodic cyclic oxidation environment, and the coating has an anti-oxidation effect on the molybdenum and molybdenum alloy protection tube.

Description

technical field [0001] The invention relates to a metal surface treatment method, in particular to a method for preparing an anti-oxidation coating on the surface of molybdenum and its alloy protective tube. Background technique [0002] The molybdenum tube prepared by thermoplastic processing has good high-temperature airtightness, which can meet the test requirements of tungsten-rhenium thermocouple wire in the atmosphere protection furnace. However, the oxidation resistance of molybdenum is poor, which limits the use of molybdenum protection tubes in oxidizing atmospheres. [0003] The preparation of anti-oxidation coatings on the surface of molybdenum and its alloys is the main idea to make molybdenum and its alloys have oxidation resistance at high temperatures. At present, the use of molybdenum-based silicide coating is the most common, because the dense SiO formed on the surface of the coating when the silicide is oxidized 2 layer, which can block the diffusion of o...

Claims

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Application Information

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IPC IPC(8): C23C8/78C23C8/02C23C8/80
CPCC23C8/78C23C8/02C23C8/80Y02E30/30
Inventor 何浩然刘奇薄新维王小宇刘成超王焱辉姚志远韩校宇
Owner CHONGQING MATERIALS RES INST
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