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Refractory metal high-temperature antioxidant Si-Mo-YSZ coating and preparation method thereof

A refractory metal, si-mo-ysz technology, applied in the field of high temperature anti-oxidation coating preparation, can solve the problem of low temperature protection of high temperature anti-oxidation coating, achieve high viscosity, low evaporation rate, excellent ultra-high temperature anti-oxidation performance effect

Active Publication Date: 2018-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the protection temperature of high-temperature anti-oxidation coatings for refractory metals is relatively low, the purpose of the present invention is to provide a refractory metal Si-Mo-YSZ coating with simple preparation process, low cost and excellent ultra-high temperature oxidation resistance. layer and its preparation process to solve the problem of oxidation protection of refractory metal substrates in ultra-high temperature environments above 1700 °C

Method used

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  • Refractory metal high-temperature antioxidant Si-Mo-YSZ coating and preparation method thereof
  • Refractory metal high-temperature antioxidant Si-Mo-YSZ coating and preparation method thereof
  • Refractory metal high-temperature antioxidant Si-Mo-YSZ coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0059] (1) Substrate pretreatment: select TZM molybdenum alloy as the substrate, polish with sandpaper until the surface is smooth and flat, then carry out pickling and alkali cleaning, then ultrasonically clean it in alcohol, and put it in a drying oven for drying.

[0060] (2) Slurry preparation: according to the mass fraction of 58.5% Si powder, 29% Mo powder and 9.5% YSZ powder, the average particle size of the three is 1μm, 3μm and 100nm; choose 0.1μm SiO 2 powder, 2μm NH 3 F powder and 5 μm PVB powder are used as additives, and the mass fraction ratios are 0.5%, 2% and 0.5% respectively; the purity of the six powders is not less than 99%. Put the prepared coating raw materials into a ball milling tank, the ball milling medium is ethanol, the ball to material ratio is 8:1, the rotating speed is 300r / min, and the ball milling time is 10h.

[0061] (3) Coating the slurry evenly and drying: The slurry described in (2) is uniformly coated on the surface of the molybdenum all...

Embodiment 2

[0066] (1) Substrate pretreatment: select TZM molybdenum alloy as the substrate, polish with sandpaper until the surface is smooth and flat, then carry out pickling and alkali cleaning, then ultrasonically clean it in alcohol, and put it in a drying oven for drying.

[0067] (2) Slurry preparation: according to the mass fraction of 54% Si powder, 25% Mo powder and 15% YSZ powder, the average particle size of the three is 1μm, 3μm and 100nm; choose 0.1μm SiO 2 powder, 2μm NH 3 F powder is used as an additive, and the mass fraction ratio is 0.5% and 5.5% respectively; the purity of the five kinds of powders is not less than 99%. Put the prepared coating raw materials into a ball milling tank, the ball milling medium is ethanol, the ball to material ratio is 5:1, the rotating speed is 350r / min, and the ball milling time is 7h.

[0068] (3) Coating the slurry evenly and drying: the slurry described in (2) is evenly coated on the surface of the molybdenum alloy substrate after dry...

Embodiment 3

[0072] (1) Substrate pretreatment: select Ta-10W alloy as the substrate, polish it with sandpaper until the surface is smooth and flat, then carry out pickling and alkali cleaning treatment, then ultrasonically clean it in alcohol, and put it in a drying box to dry .

[0073] (2) Slurry preparation: according to the mass fraction of 56% Si powder, 30% Mo powder and 10% YSZ powder, the average particle size of the three is 1μm, 2μm and 200nm; choose 0.5μm SiO 2 Powder and 5 μm PVB powder are used as additives, and the mass fraction proportions are 3% and 1% respectively; the purity of the five kinds of powders is not less than 99%. Put the prepared coating raw materials into a ball milling tank, the ball milling medium is ethanol, the ball-to-material ratio is 10:1, the rotating speed is 400r / min, and the ball milling time is 6h.

[0074] (3) Evenly coat the slurry and dry: apply the slurry described in (2) evenly on the surface of the Ta-10W alloy substrate after drying in (1...

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Abstract

The invention relates to a refractory metal high-temperature antioxidant Si-Mo-YSZ coating and a preparation method thereof. The refractory metal high-temperature antioxidant Si-Mo-YSZ coating is madefrom, by weight, 45-65% of Si, 25-40% of Mo, 2-15% of YSZ (yttria-stabilized zirconia), and 2-8% of additives. Materials of coating are made into a slurry first; the slurry is applied to the surfaceof a refractory metal; the refractory metal is sintered at 1370-1530 DEG C for 20-90 min. since the coating composition is reasonably made in conjunction with thermal expansion coefficient of a refractory metal base, the coating, during use, can quickly form a ZrSiO4-ZrO2-SiO2 composite oxide film, effectively reducing oxygen diffusion coefficient of the coating, and implementing long-term antioxidant use of various refractory metals at the temperature of 1700 DEG C and above. The preparation method is simple and low in cost; the coating has good thermal matching with a base; high-temperatureoxidation resistance of refractory metals can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature oxidation-resistant coatings, and in particular relates to a high-temperature oxidation-resistant Si-Mo-YSZ coating of refractory metal materials and a preparation method thereof. Background technique [0002] Refractory metals and their alloys have the advantages of high temperature strength, good processing plasticity, and strong corrosion resistance to liquid metals. The operating temperature range can reach 1300°C to 2300°C, which is higher than that of superalloys, so they are widely used in the aerospace industry and nuclear industry. and other high temperature applications. However, due to the high oxygen affinity and high solubility of refractory metals, their high-temperature oxidation resistance is extremely poor. When they are far below the service temperature (about 700°C), they will be severely oxidized and their high-temperature mechanical properties will drop...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/58C04B35/14C04B35/16C04B35/48C04B35/495C04B35/622
CPCC04B35/14C04B35/16C04B35/48C04B35/495C04B35/58092C04B35/62222C04B35/66
Inventor 蔡圳阳肖来荣赵小军刘赛男郭蕾浦荣朴盛铭唐新阳操沁璇
Owner CENT SOUTH UNIV
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