A preparation method of ultrafine tungsten carbide-based spherical thermal spray powder

A thermal spraying powder, tungsten carbide-based technology, applied in the direction of coating, molten spraying, metal material coating process, etc., can solve the problems of tungsten carbide grain growth, low product utilization rate, complex process, etc., to achieve sintering The effect of short time, reduced sintering time, and shortened production process

Active Publication Date: 2018-03-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of tungsten carbide grain growth, oxidative decarburization, low product utilization rate, complex process and high energy consumption caused by long-term high-temperature treatment of ultra-fine tungsten carbide-based spherical thermal spray powder in the traditional powder-making process. and high cost, provide a new method of preparation of ultra-fine tungsten carbide-based spherical thermal spray powder

Method used

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  • A preparation method of ultrafine tungsten carbide-based spherical thermal spray powder
  • A preparation method of ultrafine tungsten carbide-based spherical thermal spray powder
  • A preparation method of ultrafine tungsten carbide-based spherical thermal spray powder

Examples

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Effect test

Embodiment 1

[0083] Embodiment 1: ultrafine WC-17Co thermal spray powder

[0084]First, 83wt% tungsten carbide powder (particle size 100-300nm) and 17wt% cobalt powder (particle size 1-2μm) are added to the ball mill, and absolute ethanol is added at the same time. Alloy grinding balls, the ball-to-material ratio is 4:1, the ball milling speed is 50r / min, and the ball milling time is 12h; after wet milling, add polyethylene glycol accounting for 2% of the mixed powder mass fraction, stir for 2h, and place in a closed spray drying tower Carry out granulation to obtain granulated powder, the inlet temperature is controlled at 240°C, the outlet temperature is controlled at 120°C, the atomizer speed is 18000r / min, the drying and protective atmosphere is nitrogen, and the tower pressure is 2KPa; the granulated powder is placed in a tube The degreasing treatment was carried out in a vertical furnace at a temperature of 800°C for 12 hours; the degreasing powder was transiently sintered in a verti...

Embodiment 2

[0090] Example 2: Ultrafine WC-10Co-4Cr 3 C 2 thermal spray powder

[0091] First, add 86wt% tungsten carbide powder (particle size 100-300nm), 10wt% cobalt powder (particle size 1-2μm) and 4wt% chromium carbide powder (particle size 100-300nm) into the ball mill, and add anhydrous For ethanol, two sizes of Ф16mm and Ф6mm YG6 cemented carbide grinding balls are used for the grinding balls, the ball-to-material ratio is 3:1, the ball milling speed is 35r / min, and the ball milling time is 10h; Diol, after stirring for 2 hours, granulate in a closed spray drying tower to obtain granulated powder, the inlet temperature is controlled at 220°C, the outlet temperature is controlled at 105°C, the atomizer speed is 14000r / min, drying and protective atmosphere It is nitrogen, and the tower pressure is 1.5KPa; the granulated powder is degreased in a tube furnace at a temperature of 550°C for 9 hours; (carrier gas flow rate is 85ml / min) under the action of acceleration and continuous u...

Embodiment 3

[0097] Example 3: Ultrafine WC-10Co-4Cr 3 C 2 thermal spray powder

[0098] First, add 86wt% tungsten carbide powder (particle size 100-300nm), 10wt% cobalt powder (particle size 1-2μm) and 4wt% chromium carbide powder (particle size 100-300nm) into the ball mill, and add anhydrous For ethanol, two sizes of Ф16mm and Ф6mm YG6 cemented carbide grinding balls are used for the grinding balls, the ball-to-material ratio is 2:1, the ball milling speed is 20r / min, and the ball milling time is 8h; Diol, after stirring for 2 hours, granulate in a closed spray drying tower to obtain granulated powder, the inlet temperature is controlled at 200°C, the outlet temperature is controlled at 90°C, the atomizer speed is 10000r / min, drying and protective atmosphere Nitrogen, the tower pressure is 1KPa; degrease the granulated powder in a tube furnace at a temperature of 300°C for 6 hours; transiently sinter the degreased powder in a vertical sintering furnace, and the powder is carried out i...

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Abstract

The invention relates to a preparation method of ultrafine tungsten carbide-based spherical thermal spray powder, belonging to the technical field of preparation of special materials. The present invention distributes the raw material powder according to the design group, and the raw material powder is sprayed and granulated after wet ball milling; the semi-finished product with a particle size of 5-150 μm is obtained; After flowing into the vertical sintering furnace with the protective gas, the transient sintering is completed in the high temperature zone of the vertical sintering furnace; cooling and grading to obtain the ultrafine tungsten carbide-based spherical thermal spray powder; the temperature of the transient sintering is 1000 ‑1500℃, when transient sintering, the average sintering time of a single degreased powder is 1‑10s. The preparation process of the invention is simple, the obtained product has excellent performance, and is convenient for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of ultrafine tungsten carbide-based spherical thermal spray powder, belonging to the technical field of preparation of special materials. Background technique [0002] Since cemented carbide came out in 1923, because of its excellent properties such as high hardness, high red hardness, high compressive strength, high wear resistance and good corrosion resistance, it is known as "the tooth of industry" and is widely used in It involves almost every sector of the national economy and every field of modern technology. [0003] As a typical cemented carbide material, tungsten carbide-based cemented carbide has been devoted to improving its contradictory properties of hardness and toughness. Studies have shown that refining tungsten carbide grains can significantly improve the properties of the material such as hardness and toughness, and the magnitude of improvement increases with the further reduction of tung...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/129C22C1/05C22C29/08C22C19/07B22F9/04
Inventor 姚萍屏贡太敏
Owner CENT SOUTH UNIV
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