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A preparation process of cermet powder for thermal spraying

A preparation process and cermet technology, which is applied in metal material coating process, metal processing equipment, coating, etc., can solve the problem of incompatibility between spray deposition rate and coating density, and achieve high density and good comprehensiveness effect, the effect of improving the deposition rate

Active Publication Date: 2019-06-07
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention intends to solve the problems of how to improve the utilization rate of spray granulated cermet powder, maintain the stability of the spraying process, and the powder spraying deposition rate and coating density can not be achieved at the same time.

Method used

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  • A preparation process of cermet powder for thermal spraying
  • A preparation process of cermet powder for thermal spraying
  • A preparation process of cermet powder for thermal spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) Add 88wt.% WC (particle size ~2.5 microns) and 12wt.% Co powder (1-3 microns particle size) to the ball milling barrel respectively, and add 88 wt.% of the total mass of powder raw materials to the barrel 23wt.% of deionized water and 2wt.% of polyvinyl alcohol were added into WC-Co cemented carbide balls according to the ball-to-material ratio of 6:1, and ball milled for 30 hours to obtain slurry P1.

[0069] (2) The slurry P1 is gradually introduced into the top container of the spray drying tower, and subjected to centrifugal spray drying to obtain spherical WC-12Co powder P2 with different particle sizes.

[0070] (3) The P2 powder is classified into two kinds of WC-12Co powders P3 and P4 with a particle size of 5-25 μm and 25-53 μm by sieving and airflow classification.

[0071] (4) P3 powder was sintered at 1195°C to obtain high-density P5 powder, and P4 powder was sintered at 1175°C to obtain low-density P6 powder. The sintering furnace used can be with redu...

Embodiment 2

[0077](1) Add 88wt.% WC (particle size ~2.5 microns) and 12wt.% Co powder (1-3 microns particle size) to the ball milling barrel respectively, and add 88 wt.% of the total mass of powder raw materials to the barrel 23wt.% of deionized water and 2wt.% of polyvinyl alcohol were added into WC-Co cemented carbide balls according to the ball-to-material ratio of 6:1, and ball milled for 30 hours to obtain slurry P1.

[0078] (2) The slurry P1 is gradually introduced into the top container of the spray drying tower, and subjected to centrifugal spray drying to obtain spherical WC-12Co powder P2 with different particle sizes.

[0079] (3) The P2 powder is classified into three kinds of WC-12Co powders P3, P4 and P5 with particle sizes of 5-20 microns, 20-38 microns and 38-53 microns by sieving and airflow classification.

[0080] (4) P3 powder was sintered at 1195°C to obtain high-density P6 powder, and P4 powder was sintered at 1185°C to obtain medium-density P7 powder. P5 powder w...

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Abstract

The invention discloses a preparation process of metal ceramic powder for thermal spraying, which comprises the following steps: (1) mixing metal powder and ceramic powder for ball milling to obtain slurry A; (2) spraying and granulating the slurry A to obtain Powder B; (3) Classify powder B to obtain two or more grades of powder C with different particle sizes; (4) sinter powders with different particle sizes at different temperatures, respectively crush and classify them after sintering to obtain different loose powders. Powder D of packing density; (5) Mixing powder D of different bulk density to obtain cermet powder for spraying. The invention improves the utilization rate of the cermet powder, improves the deposition rate of thermal spraying, increases the density of the coating, and obtains a better comprehensive effect.

Description

technical field [0001] The invention relates to a preparation process of cermet powder for thermal spraying, which belongs to the field of thermal spraying. Background technique [0002] The cermet powders currently used for thermal spraying, especially supersonic flame spraying, include WC-Ni, WC-Co, WC-CoCr, WC-Cr 3 C 2 -Ni, Cr 3 C 2 -NiCr and other cermet powder materials. The above powder materials can be used to prepare corresponding composite coatings, which are widely used in industrial production where anti-corrosion and wear resistance are required. At present, cermet powder is mostly prepared by agglomeration method, and its process generally consists of material mixing and ball milling, spray granulation, sintering, crushing and sieving and classification. [0003] In the above process, spray granulation is to agglomerate fine particles of metal and ceramic particles into larger spherical particles, which is convenient for smooth powder delivery during sprayin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06B22F9/04B22F1/00
CPCC23C4/06C23C4/129B22F9/04B22F1/14
Inventor 王群陈金雄周小峰
Owner HUNAN UNIV
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