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A kind of molybdenum disilicide composite coating and preparation method thereof

A technology of molybdenum disilicide and composite coating, which is applied in coating, metal material coating process, fusion spraying, etc., and can solve problems such as oxidation failure and insufficient coating thickness

Active Publication Date: 2020-10-27
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a molybdenum disilicide composite coating, which solves the problems of insufficient coating thickness and oxidation failure prepared by the existing molybdenum disilicide coating preparation technology, improves the high temperature oxidation resistance of the coating, and prolongs the coating life. service life

Method used

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Examples

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Effect test

preparation example Construction

[0030] A preparation method of a molybdenum disilicide composite coating, specifically implemented according to the following steps:

[0031] Step 1, screening molybdenum disilicide powder with a particle size of 1-10 μm and a powder purity greater than 99 at%, and additive powder with a particle size of 100 nm-10 μm;

[0032] Step 2. Weigh molybdenum disilicide powder and additive powder, and mix the two in a ball mill for 10-16 hours to form composite powder A;

[0033] Step 3, the composite powder A is sintered by powder metallurgy, crushed and granulated, and then the composite powder M with a particle size of 30-150 μm and good fluidity is screened;

[0034] Step 4. Load the composite powder M into the synchronous powder feeder;

[0035] Step 5, select molybdenum, niobium, tantalum and their alloys for the rough spray welding workpiece, mechanically grind with a grinding wheel, remove the surface oxide layer, and wipe with absorbent cotton moistened with absolute ethanol...

Embodiment 1

[0045] A preparation method of a molybdenum disilicide composite coating, specifically implemented according to the following steps:

[0046] Step 1. Screen molybdenum disilicide powder with a particle size of 1 μm and a powder purity greater than 99at% and additive powder. The additive powder is B powder with a particle size of 1 μm;

[0047] Step 2, weighing the additional powder 1.5wt% B powder screened in step 1, and the rest being molybdenum disilicide powder, mixing the two in a planetary ball mill for 10 hours to form composite powder A,

[0048] Step 3, the composite powder A is sintered by powder metallurgy, crushed and granulated, and then the composite powder M with a particle size of 30-150 μm and good fluidity is screened;

[0049] Step 4. Load the composite powder M into the synchronous powder feeder;

[0050] Step 5. Select a pure molybdenum plate with a size of 120 × 50 × 10 mm for the rough spray welding workpiece, mechanically grind it with a grinding wheel,...

Embodiment 2

[0056] Step 1. Screen molybdenum disilicide powder and additive powder with a particle size of 5 μm and a powder purity greater than 99at%. The additive powder is: ZrB with a particle size of 3 μm 2 powder;

[0057] Step 2, weighing the additional powder 8wt%ZrB screened out through step 1 2 powder, the rest is molybdenum disilicide powder, and the two are mixed in a planetary ball mill for 13 hours to form composite powder A,

[0058] Step 3, the composite powder A is sintered by powder metallurgy, crushed and granulated, and then the composite powder M with a particle size of 30-150 μm and good fluidity is screened;

[0059] Step 4. Load the composite powder M into the synchronous powder feeder;

[0060] Step 5. Coarse spray welding workpiece. Select a niobium alloy plate with a size of 120×50×10mm as the spray welding workpiece, mechanically grind it with a grinding wheel, remove the surface oxide layer, wipe it with absorbent cotton moistened with absolute ethanol, and d...

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Abstract

The invention discloses a molybdenum disilicide composite coating and a preparation method thereof. A plasma arc spray welding technique is utilized, molybdenum disilicide composite powder modified byB, Al, Cr alloy elements or molybdenum disilicide composite powder reinforced by ZrB2, SiB6, LaB6 grains is used as spray welding powder, and the molybdenum disilicide composite coating of which thethickness is 0.5 to 6 mm is prepared on the surfaces of molybdenum, niobium, tantalum and alloy materials. The molybdenum disilicide composite coating prepared by utilizing the preparation method of the molybdenum disilicide composite coating has excellent high-temperature oxidation resistance in the atmosphere of 900 DEG C to 1700 DEG C, and long-life effective protection is provided for refractory metal parts and components. The molybdenum disilicide composite coating has the advantages of simple process, flexible component design of the coating, high production efficiency and moderate costand has popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of high-temperature oxidation-resistant coatings, and relates to a molybdenum disilicide composite coating; the invention also relates to a preparation method of the molybdenum disilicide composite coating. Background technique [0002] Refractory metals molybdenum, niobium, tantalum and their alloys have the advantages of high melting point, excellent high temperature mechanical properties, high temperature creep strength and wear resistance, so they are widely used in aviation, aerospace, energy and transportation and other fields. Structural materials used at high temperatures must not only have high high-temperature strength and fracture toughness, but also have certain high-temperature oxidation resistance. However, refractory metals molybdenum, niobium, tantalum and their alloys will be severely oxidized when the temperature is higher than 600°C in an oxidizing atmosphere, and the higher the temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/10C23C4/06
CPCC23C4/06C23C4/10C23C4/134
Inventor 张国君邓新科任帅王涛
Owner XIAN UNIV OF TECH
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