Method for preparing modified composite Hf-Ta metal coating through laser cladding

A technology of laser cladding and metal coating, which is applied in the direction of metal material coating process, coating, metal processing equipment, etc., can solve the problems of inability to effectively prevent oxygen diffusion, poor bonding force, cracking, etc., and avoid the use of target materials Low efficiency, reduced impact, and light interdiffusion effects

Active Publication Date: 2016-03-09
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the HfO produced by the oxidation of pure Hf at high temperature 2 The oxide film is loose and porous and has poor bonding force with the substrate, which cannot effectively block the diffusion of oxygen to the substrate, and the HfO 2 There is a martensitic transformation from monoclinic phase to tetragonal phase at 1750 ° C. During the heating and cooling cycle, HfO 2 prone to cracking and peeling

Method used

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  • Method for preparing modified composite Hf-Ta metal coating through laser cladding
  • Method for preparing modified composite Hf-Ta metal coating through laser cladding
  • Method for preparing modified composite Hf-Ta metal coating through laser cladding

Examples

Experimental program
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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1, pickling the surface of the refractory metal after grinding, and then performing sandblasting and degreasing treatment on the surface of the refractory metal after pickling; the sand used in the sandblasting is corundum sand, and the sandblasting The pressure is 0.4MPa; the refractory metal is a Ta10W alloy; the acid solution used in the pickling is formed by mixing hydrofluoric acid and concentrated nitric acid in a volume ratio of 7:3, and the mass concentration of the hydrofluoric acid is 50 %, the mass concentration of the concentrated nitric acid is 67%; preferably, the refractory metal is immersed in acetone for degreasing treatment;

[0031] Step 2: Put the mixed powder and dispersant in a ball mill and mix them uniformly to obtain a modified composite Hf-Ta slurry; the mixed powder is uniformly mixed with tantalum powder, hafnium powder and modified metal powder, and the mixed The mass percent composi...

Embodiment 2

[0036] This example is the same as Example 1, except that the modified metal powder in step 2 is one, two or more of silicon powder, boron powder, aluminum powder, chromium powder and iron powder , or a mixture of one of boron powder, aluminum powder, chromium powder and silicon powder, iron powder, or a mixture of two of boron powder, aluminum powder, chromium powder and one of silicon powder, iron powder.

[0037] The microscopic region of the modified composite Hf-Ta metal coating prepared on the surface of the refractory metal in this example is flat, indicating that the metal coating melts well in the process of pre-sintering and laser cladding, and the modified composite Hf-Ta The metal coating is very continuous, and the metal coating is well combined with the refractory metal substrate, which is beneficial to provide better high temperature protection for the refractory metal substrate; the oxidation test shows that the modified composite prepared in this embodiment on ...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1, pickling the surface of the refractory metal after grinding, and then performing sandblasting and degreasing treatment on the surface of the refractory metal after pickling; the sand used in the sandblasting is zirconia sand, and the sandblasting The processing pressure is 0.3MPa; the refractory metal is a C103 alloy; the acid solution used in the pickling is mixed by hydrofluoric acid and concentrated nitric acid in a volume ratio of 3:2, and the mass concentration of the hydrofluoric acid is 60%, the mass concentration of the concentrated nitric acid is 65%; preferably, the refractory metal is immersed in acetone to carry out degreasing treatment;

[0041] Step 2: Put the mixed powder and dispersant in a ball mill and mix them uniformly to obtain a modified composite Hf-Ta slurry; the mixed powder is uniformly mixed with tantalum powder, hafnium powder and modified metal powder, and the mixed The mass per...

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Abstract

The invention discloses a method for preparing a modified composite Hf-Ta metal coating through laser cladding. The method comprises the steps that firstly, refractory metal is subjected to acid pickling after polishing treatment and then subjected to sand blasting treatment and ungrease treatment in sequence; secondly, mixed powder and a dispersing agent are placed in a ball mill to be subjected to ball milling and mixed evenly to obtain modified composite Hf-Ta slurry; thirdly, the modified composite Hf-Ta slurry is pre-placed on the surface of the refractory metal to obtain a pre-placed layer on the surface of the refractory metal after drying, then presintering treatment is conducted, and a presintered layer is obtained on the surface of the refractory metal; and fourthly, laser cladding is conducted on the presintered layer, and the modified composite Hf-Ta metal coating with the thickness being 30 [mu]m-800 [mu]m is obtained on the surface of the refractory metal. According to the modified composite Hf-Ta metal coating prepared through the method, the oxidation resistance of the refractory metal in a superhigh-temperature and low-oxygen-pressure environment can be significantly improved, and short-term protection can be provided for the refractory metal in a superhigh-temperature oxidation environment or an ablation environment.

Description

technical field [0001] The invention belongs to the technical field of high temperature protection, and in particular relates to a method for preparing a modified composite Hf-Ta metal coating by laser cladding. Background technique [0002] Refractory alloys have excellent high-temperature strength and toughness and good processing properties, and have been widely used in the aerospace industry, aviation industry and atomic energy industry. However, the application of refractory alloys in ultra-high temperature oxidation environments has oxidation resistance problems. Because of their high oxygen affinity and high oxygen solubility, they are easy to absorb oxygen at room temperature and severely oxidized when they are far below the service temperature. There are two possible ways to solve this anti-oxidation problem: one is to start with alloy design and develop alloys with high-temperature oxidation resistance; the other is to apply high-temperature anti-oxidation coatings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B22F7/02B22F1/00C22C27/00B22F3/10
CPCC22C27/00C23C24/103B22F3/10B22F7/02B22F3/1007B22F2999/00B22F1/10B22F2201/20Y02T50/60
Inventor 汪欣李争显杜继红唐勇杨涛李晴宇叶源盛
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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