Reaction spray coating metal ceramic composite powder and method for producing the same

A technology of spraying metal and ceramic composite, applied in the direction of metal material coating process, coating, melting spray plating, etc., can solve the problem of insufficient cermet reaction, and achieve the effect of excellent combination and uniform composition

Inactive Publication Date: 2008-06-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the prior art, to provide a reaction spraying cermet composite powder and its preparation method, so as to solve the problem of insufficient reaction of cermets in the re

Method used

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  • Reaction spray coating metal ceramic composite powder and method for producing the same
  • Reaction spray coating metal ceramic composite powder and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Preparation of metal / ceramic composite coating by reactive spraying on Q235 steel

[0033] 1. Preparation of metal / ceramic composite powder

[0034] (1) Put 142g of titanium powder and 54g of boron carbide powder into a planetary ball mill with a ball-to-material ratio of 2:1, add an appropriate amount of ethanol at a speed of 580rpm, and mix for 10 hours until uniformly mixed;

[0035] (2) drying the evenly stirred powder in an oven at 50°C;

[0036] (3) Add 4g of polyvinyl alcohol binder to the composite powder, mix well, put it on a tablet press, press at 15MPa, and take 10min:

[0037] (4) Put the pressed block into a vacuum carbon tube furnace, heat it to 900°C, and keep the vacuum at 10 -5 Pa, keep warm for 1h and then cool down;

[0038] (5) The sintered composite powder is crushed, ball milled, and the powder with a diameter of -50 μm is screened out.

[0039] 2. Preparation of metal / ceramic composite coatings by reactive plasma spraying

[00...

Embodiment 2

[0050] 1. Preparation of metal / ceramic composite powder

[0051] (1) Put 126g of titanium powder and 66g of boron carbide powder into a planetary ball mill with a ball-to-material ratio of 2.5:1, add ethanol for wet grinding at a speed of 580rpm, and mix for 17h until uniform;

[0052] (2) drying the evenly stirred powder in an oven at 50°C;

[0053] (3) Add 8g of polyvinyl alcohol binder to the composite powder, mix well, put it on a tablet press, press at 18MPa, and take 10min:

[0054] (4) Put the pressed block into a vacuum carbon tube furnace, heat it to 800°C, and keep the vacuum degree at 10 -5 Pa, keep warm for 3 hours and then cool down;

[0055] (5) The sintered composite powder is crushed, ball milled, and the powder with a diameter of -50 μm is screened out.

[0056] 2. Preparation of metal / ceramic composite coatings by reactive plasma spraying

[0057] (1) Roughen the surface of Q235 steel on the grinding wheel to expose the fresh metal surface;

[0058] (2) ...

Embodiment 3

[0063] 1. Preparation of metal / ceramic composite powder

[0064] (1) Put 154g of titanium powder and 34g of boron carbide powder into a planetary ball mill with a ball-to-material ratio of 3:1, add an appropriate amount of ethanol at a speed of 580rpm, and mix for 24 hours until uniform;

[0065] (2) drying the evenly stirred powder in an oven at 50°C;

[0066] (3) Add 12g of polyvinyl alcohol binder to the composite powder, mix well, put it on a tablet press, press at 20MPa, and take 10min:

[0067] (4) Put the pressed block into a vacuum carbon tube furnace, heat it to 1000°C, and keep the vacuum at 10 -5 Pa, keep warm for 2h and then cool down;

[0068] (5) The sintered composite powder is crushed, ball milled, and the powder with a diameter of -50 μm is screened out.

[0069] 2. Preparation of metal / ceramic composite coatings by reactive plasma spraying

[0070] Its preparation process is with embodiment 2

[0071] 3. After testing: a Co-Ti-N-B composite coating is fo...

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Abstract

The invention provides reaction metal spraying ceramic composite powder and the preparation method thereof, which comprises the following steps: firstly, metal and ceramic powder are mixed according to the proportion, and then put into a ball grinder to be ground, the ball material ratio is 2:1 to 3:1, ethanol is added to wet the powder fully, and the ball grinding is operated; secondly, the powder which is mixed evenly is dried; thirdly, adhesion agent is added into the compound powder, fully mixed and put on a tablet pressing machine to press; fourthly, the pressed blocks are put into a vacuum carbon tube furnace, heated, thermally insulated and then cooled; fifthly, the compound powder after being sintered is crashed and ball-ground, and the power which is required is screened out. The weight percentage of the components of the obtained composite powder is as follows: 63-77 percent of Ti powder, 17-33 percent of B4C, and 2-6 percent of bonding agent. The components of the powder of the invention are mixed, the bonding is good, the fluidity is good, and the full operation of the reaction in the spray coating process can be guaranteed to prepare ceramic composite coating with high performance.

Description

technical field [0001] The invention relates to a preparation method in the technical field of cermet materials, in particular to a reaction sprayed cermet composite powder and a preparation method thereof. Background technique [0002] Reactive spraying refers to the combination of self-propagating reaction and thermal spraying technology, using the reaction heat of self-propagating reaction to promote the melting of sprayed particles and product particles, so as to obtain high-melting ceramic or intermetallic compound coatings that are difficult to prepare by conventional methods. Therefore, the low-cost and high-efficiency preparation of high-performance ceramic-based coatings can be realized. At present, SHS arc spraying, SHS plasma spraying, thermal explosion reaction spraying and other technologies have appeared, and the coating involves Ti-C, Ti-B, Ti-N, Mo-Si, Ni-Al, Ti-B-N and other systems. Since the heat of the self-propagating reaction can be used, low-power spr...

Claims

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Application Information

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IPC IPC(8): C23C4/04B22F9/04
Inventor 马静毛正平王俊孙宝德
Owner SHANGHAI JIAO TONG UNIV
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