Molybdenum boride ceramic system hot spray coating material, and preparation method and application of molybdenum boride ceramic system hot spray coating material

A coating material and thermal spraying technology, applied in coating, metal material coating process, fusion spraying, etc., can solve unsatisfactory coating performance, easy cracking of surface boronizing coating, and coating life No long-term problems, to achieve the effect of high hardness, good fluidity and excellent sphericity

Inactive Publication Date: 2017-02-15
LUOYANG GOLDEN EGRET GEOTOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commonly used coatings include surface boronizing, HVOF spraying WC-Co or Fe-Al, plasma spraying ceramic coatings, etc. Although the above solutions can achieve certain results, the coating performance is still not enough in harsh environments. satisfying
For example, the surface of the boronized coating is easy to crack, which leads to protection failure. The HVOF sprayed WC-Co coating is easy to peel off and has limited corrosion resistance. The plasma sprayed ceramic coating has a large difference between the thermal expansion coefficient of the coating and the substrate, and the mechanical strength is not good. Good, coating life is not long

Method used

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  • Molybdenum boride ceramic system hot spray coating material, and preparation method and application of molybdenum boride ceramic system hot spray coating material
  • Molybdenum boride ceramic system hot spray coating material, and preparation method and application of molybdenum boride ceramic system hot spray coating material

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Experimental program
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Effect test

Embodiment 1

[0032] 1) According to MoB 69%, MoB 2 6%, Ni 17%, Cr 5%, WB 1.5%, WB 2 1.5% by weight proportioning ingredients, used MoB, MoB 2 and WB, WB 2The average particle size of raw materials is 4 μm, the average particle size of Ni raw materials is 3 μm, and the average particle size of Cr raw materials is 3 μm. Put the materials into a ball mill, and use pure water with a conductivity of 4 us / cm as the grinding medium according to the ball-to-material ratio of 4:1. , and add polyvinyl alcohol accounting for 16% of the total mass of raw materials to the mixed material, and perform ball milling for 24 hours; after that, spray the obtained slurry to granulate, and then sinter under vacuum conditions, the sintering vacuum degree is -98KPa, and the sintering temperature It is 1400℃, and the sintering time is 0.5h. After sintering, the obtained material is pulverized, and then the obtained powder is classified to obtain a thermal spray coating material with a particle size of 15-45 μ...

Embodiment 2

[0036] 1) According to MoB 52%, MoB 2 8%, Co19%, Cr 16%, WB 3%, WB 2 1%, W 2 B 5 1% weight percentage proportioning ingredients, MoB and MoB used 2 and WB, WB 2 , W 2 B 5 The average particle size of raw materials is 1 μm, the average particle size of Co raw materials is 0.8 μm, and the average particle size of Cr raw materials is 3 μm. Put the materials into a ball mill, and use pure water with a conductivity of 5 us / cm as the grinding according to the ball-to-material ratio of 3:1. Medium, and add polyvinyl alcohol accounting for 11% of the total mass of raw materials to the mixed material, and perform ball milling for 72 hours; after that, spray granulate the obtained slurry, and then sinter under vacuum conditions, the sintering vacuum degree is -96KPa, sintering The temperature is 1100°C, and the sintering time is 4h. After sintering, the obtained material is pulverized, and then the obtained powder is classified to obtain a thermal spray coating material with a p...

Embodiment 3

[0040] 1) According to MoB 58%, MoB 2 2%, Co 30%, Cr 5%, WB 2%, WB 2 3% by weight proportioning ingredients, MoB and MoB used 2 and WB, WB 2 The average particle size of raw materials is 5 μm, the average particle size of Co raw materials is 2 μm, and the average particle size of Cr raw materials is 2 μm. Put the materials into a ball mill, and use pure water with a conductivity of 3 us / cm as the grinding medium according to the ball-to-material ratio of 4:1. , and add polyvinyl alcohol accounting for 16% of the total mass of raw materials to the mixed material, and carry out ball milling for 72 hours; after that, spray granulate the obtained slurry, and then carry out sintering under vacuum conditions, the sintering vacuum degree is -96KPa, and the sintering temperature It is 1000℃, and the sintering time is 3h. After sintering, the obtained material is pulverized, and then the obtained powder is classified to obtain a thermal spray coating material with a particle size ...

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Abstract

The invention relates to a molybdenum boride ceramic system hot spray coating material which comprises the following ingredients by mass percentage: 60-80% of MoxBy, 10-30% of Ni or Co, 5-20% of Cr, and 0-5% of WmBn, wherein MoxBy is at least one of MoB or MoB2, and WmBn is at least one of WB or WB2 or W2B5. The molybdenum boride ceramic system hot spray coating material having significant advantages in aspects of thermal erosion resistance, high-temperature skimming wear resistance, molten metal erosion resistance and the like is prepared via unique raw material selection and proportion, as well as corresponding technical steps and parameter limitation, and is particularly applicable to surface hot spraying of spare parts such as sink rolls, stable rolls and shaft sleeves of a garbage incinerator and a hot galvanizing production line.

Description

technical field [0001] The invention belongs to the technical field of surface engineering and thermal spraying, and in particular relates to the preparation and application of a molybdenum boride ceramic thermal spraying coating material. Background technique [0002] Workpieces working in some special high temperature or molten metal corrosion environment, the surface often has to withstand the test of high temperature metal erosion, thermal load caused by alternating cold and hot, and some special friction, so a special coating is required technology to meet these demanding requirements. At present, commonly used coatings include surface boronizing, HVOF spraying WC-Co or Fe-Al, plasma spraying ceramic coatings, etc. Although the above solutions can achieve certain results, the coating performance is still not enough in harsh environments. Satisfying. For example, the surface of the boronized coating is easy to crack, which leads to protection failure. The HVOF sprayed ...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/129C23C4/134C22C29/14B22F1/00B22F9/04
CPCC22C29/005C22C29/14C23C4/06B22F9/04B22F2009/043B22F1/10
Inventor 谢屹峰杨跃刘宝刚张国峰孙志鹏
Owner LUOYANG GOLDEN EGRET GEOTOOLS
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