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Metal ceramic coating provided with multi-scale WC (wolfram carbide) crystal grains and preparation method

A cermet coating, multi-scale technology, applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of toughness decline, unable to meet the technical requirements of engineering machine parts remanufacturing, and achieve the goal of improving toughness Effect

Inactive Publication Date: 2013-09-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the toughness of WC-12Co ceramic coatings decreases significantly with the increase of hardness, which limits its inability to meet the technical requirements of remanufacturing engineering machine parts in the remanufacturing process, the present invention provides a WC with multi-scale grains A cermet coating and a preparation method thereof, the purpose of which is to significantly increase the strength and hardness of the WC-12Co coating without reducing the strength and hardness of the WC-12Co coating through the use of thermal spraying technology to uniformly distribute WC grains of different sizes in the coating. toughness

Method used

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  • Metal ceramic coating provided with multi-scale WC (wolfram carbide) crystal grains and preparation method
  • Metal ceramic coating provided with multi-scale WC (wolfram carbide) crystal grains and preparation method
  • Metal ceramic coating provided with multi-scale WC (wolfram carbide) crystal grains and preparation method

Examples

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Effect test

Embodiment 1

[0025] Using 88% WC and 12% Co mixture as raw material, in a liquid medium, first mix WC powder and Co powder evenly, then spray dry to form solid aggregate particles with Co as an organic binder, and finally conduct heat treatment . The heat treatment temperatures are 1000°C, 1200°C and 1600°C respectively. WC-12Co powders with WC grains of nanoscale (10nm≤d3 / h, propane pressure is 0.65MPa, propane gas flow is 1.35m 3 / h, the spraying distance is 250mm, the powder feeding gas is N 2 , the gas pressure is 0.6MPa, and the powder feeding speed is 2r / min. After spraying, the coating is cooled with compressed air (see Figure 3(b, c)) and the thickness is 300μm. The SEM microstructure of the coating is shown in Figure 3(c). In the prepared coating, nano WC grains account for about 12%, submicron WC grains account for about 22%, and micron WC grains account for about 66%. Finally, after testing, its strength is ≥ 70MPa and hardness is 1200HV 0.1 ~1300HV 0.1 , the fracture toug...

Embodiment 2

[0027]Using 88% WC and 12% Co mixture as raw material, in a liquid medium, firstly mix WC powder and Co powder evenly, then spray dry to form solid aggregate particles with Co as organic binder, and finally conduct heat treatment . The heat treatment temperatures are 1100°C, 1200°C and 1500°C respectively. The WC-12Co powders with WC grains in nanometer scale (10nm≤d3 / h, propane pressure is 0.65MPa, propane gas flow is 1.35m 3 / h, the spraying distance is 250mm, the powder feeding gas is N 2 , gas pressure 0.6MPa, powder feeding speed 2r / min. After spraying, use compressed air to cool the coating thickness to 350μm. In the prepared coating, nano WC grains account for about 16%, submicron WC grains account for about 27%, and micron WC grains account for about 57%. Finally, after testing, its strength is ≥ 65MPa, and its hardness is 1100HV 0.1 ~1250HV 0.1 , the fracture toughness measured by indentation method is 13.3±1.4MPa·m 1 / 2 . Its comprehensive mechanical properties ...

Embodiment 3

[0029] Using 88% WC and 12% Co mixture as raw material, in a liquid medium, firstly mix WC powder and Co powder evenly, then spray dry to form solid aggregate particles with Co as organic binder, and finally conduct heat treatment . The heat treatment temperatures are 1100°C, 1200°C and 1400°C respectively. The WC-12Co powders with WC grains in nanometer scale (10nm≤d3 / h, propane pressure is 0.65MPa, propane gas flow is 1.35m 3 / h, the spraying distance is 250mm, the powder feeding gas is N 2 , gas pressure 0.6MPa, powder feeding speed 2r / min. After spraying, use compressed air to cool the coating thickness to 320μm. In the prepared coating, nano WC grains account for about 12%, submicron WC grains account for about 22%, and micron WC grains account for about 66%. Finally, after testing, its strength is ≥ 66MPa, and its hardness is 1100HV 0.1 ~1250HV 0.1 , the fracture toughness measured by indentation method is 13.3±1.6MPa·m 1 / 2 . Its comprehensive mechanical properties...

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Abstract

The invention relates to a metal ceramic coating provided with multi-scale WC crystal grains and a preparation method. The grain diameter of each WC crystal grain comprises nanoscale (d is larger than or equal to 10 nm and is smaller than 200 nm), submicron scale (d is larger than or equal to 200 nm and is smaller than or equal to 1 mum) and micron scale (d is larger than 1 mum and is smaller than or equal to 10 mum), and corresponding distribution proportions sequentially are 10%-15%, 20%-25% and 60%-70%. The method comprises the steps as follows: WC-12 Co thermal spray powder is mixed uniformly; a planetary ball mill is adopted to perform uniform powder mixing; sand blasting and cleaning are performed on the surface of a matrix; and a supersonic speed flame thermal spray technology is adopted to prepare a WC-12Co ceramic coating with multi-scale WC grain diameters. Under the condition that the strength and hardness of the WC-12Co ceramic coating are not reduced, the toughness of the coating is improved remarkably, therefore, the metal ceramic coating with high obdurability and abrasion resistance is obtained, and can be widely applied to the field of engineering machinery refabrication.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, in particular to a cermet coating with multi-scale WC grains and a preparation method thereof. By improving the WC grain size distribution in the WC-12Co coating, without reducing the WC In the case of the strength of -12Co coating, the toughness and wear resistance of WC-12Co thermal spray coating are significantly improved. A cermet coating with high strength, toughness and wear resistance is obtained, which can be widely used in the field of engineering machinery remanufacturing. Background technique [0002] In the field of thermal spraying, WC-12Co is one of the coating materials with high hardness and high wear resistance. In the WC-12Co thermal spraying powder, the metal Co covers the WC particles, and the WC grains are uniformly distributed on the Co matrix in the form of agglomeration. The hardness and toughness of WC-12Co determine the wear resistance of WC-12Co coatings. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/06C23C4/129
Inventor 程振雄马宁乌焕涛叶福兴
Owner TIANJIN UNIV
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