Cermet composition and method for preparing cermet coat on metal surface

A cermet coating and cermet technology, which is applied in the field of preparing cermet coatings and cermet compositions on metal surfaces, can solve the problem of high energy consumption of metal workpieces, and achieve low porosity, convenient operation and simple preparation process. Effect

Inactive Publication Date: 2008-01-09
LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: existing processes for preparing cermet coatings on metal surfaces using cermet compositions are not suitable for metal workpieces of various shapes or materials, and have relatively high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 80% by weight of mixed powder with a particle size of 40-50 μm and 20% by weight of tungsten carbide with a particle size of 40-50 μm to prepare the cermet composition of the present invention; wherein the weight % is based on the total weight of the cermet composition Benchmark. The mixed powder consists of 8% by weight of Cr, 4% by weight of B, 5% by weight of Si, 4% by weight of Fe, 4.9% by weight of Al, 0.3% by weight of lanthanide rare earth oxides and 73.8% by weight of Ni, The weight % is based on the total weight of the mixed powder. Based on the total weight of the lanthanide rare earth oxide, the composition is 54% by weight of lanthanum oxide, 26.6% by weight of neodymium oxide, 14.4% by weight of praseodymium oxide, and the rest is impurities. Impurities mainly include calcium oxide, ferric oxide, silicon dioxide, samarium oxide, europium oxide, gadolinium oxide, yttrium oxide, etc.; the following examples are the same.

[0035] The metal workpiece to ...

Embodiment 2

[0038] Mix 85% by weight of mixed powder with a particle size of 40 to 50 μm and 15% by weight of tungsten carbide with a particle size of 40 to 50 μm to prepare the cermet composition of the present invention; wherein the weight % is based on the total weight of the cermet composition Benchmark. The mixed powder consists of 7.5% by weight of Cr, 4.5% by weight of B, 3.8% by weight of Si, 2.8% by weight of Fe, 0.7% by weight of Al, 0.2% by weight of lanthanide rare earth oxides and 80.5% by weight of Ni, The weight % is based on the total weight of the mixed powder. Based on the total weight of the lanthanide rare earth oxide, the composition is 53% by weight of lanthanum oxide, 27% by weight of neodymium oxide, 15% by weight of praseodymium oxide, and the rest is impurities.

[0039] The metal workpiece to be processed is made of No. 20 carbon steel; the shape is a cuboid, with a length of 50mm, a width of 20mm, and a thickness of 2mm.

[0040] Mix and stir the above-mentio...

Embodiment 3

[0042] Mix 55% by weight of mixed powder with a particle size of 40-50 μm and 45% by weight of tungsten carbide with a particle size of 40-50 μm to prepare the cermet composition of the present invention; wherein the weight % is based on the total weight of the cermet composition. Benchmark. The mixed powder consists of 6% by weight of Cr, 3% by weight of B, 4% by weight of Si, 3% by weight of Fe, 0.2% by weight of Al, 0.1% by weight of lanthanide rare earth oxides and 83.7% by weight of Ni, The weight % is based on the total weight of the mixed powder. Based on the total weight of the lanthanide rare earth oxide, the composition is 52% by weight of lanthanum oxide, 28.6% by weight of neodymium oxide, 16% by weight of praseodymium oxide, and the rest is impurities.

[0043] The metal workpiece to be processed is made of No. 20 carbon steel; the shape is a round tube, the nominal diameter is 89mm, the wall thickness is 3mm, and the length is 1000mm.

[0044] Mix and stir the ...

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Abstract

A metal-ceramic composition and coating it on metal surface are both disclosed herewith. It consists both parts of mixed powders containing Cr, B, Si, Fe, Al, La rare-earth oxides and Ni, and carbide materials, TiC or WC. It is coated as following: mixing metal-ceramic composition with polyvinyl alcohol or ethyl estate as binding agent to be slurry, coating it onto metal surface, drying, and firing in gas protecting furnace or vacuum furnace to obtain metal-ceramic coated metal parts. It is available to various shaped parts with different materials, and reduces energy consumption.

Description

technical field [0001] The invention belongs to the technical field of metal surface coating, and relates to a cermet composition and a method for preparing a cermet coating on a metal surface. Background technique [0002] Equipment and components in the petrochemical industry have corrosion, abrasion and erosion problems under many working conditions. If a single material is used to meet the requirements of high strength, toughness, and good corrosion resistance and wear resistance, it is difficult to achieve. The surface properties of materials directly affect the service life of equipment and components. The use of surface treatment technology can change the composition and structure of the surface of metal components, thereby improving the physical and chemical properties of the material surface. In recent years, in improving the wear resistance and corrosion resistance of metal substrate surface coatings, there have been many methods for preparing metal surface coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06C22C19/05C22C30/00C23D5/02C23D7/00C23D11/00
Inventor 李选亭盛长松刘文亮晁怀瑞姜万军马新飞
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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