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Process for in-situ formation of TiC/metal composite cladding layer controlled by plasma

An in-situ generation and metal compounding technology, which is applied in the coating process and coating of metal materials, can solve the problems of wettability between ceramic particles and matrix alloys, affect the performance of ceramic composite materials, and complex processes, etc., and achieve small matrix deformation. , stress relief, simple production process

Inactive Publication Date: 2007-05-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method of preparing cermet reinforced phase is mostly to use high-purity chemical products as raw materials. First, the atmosphere is used to protect the high-temperature synthetic ceramic phase, and then the powder metallurgy method is mixed with metal, formed, and sintered to obtain cermet. The process is complicated. , the process is long, the energy consumption is high, and the cost is high. At the same time, the pollution of the ceramic phase interface during the preparation process affects the performance of the ceramic composite material. At the same time, there is also a wettability problem between the ceramic particles and the matrix alloy during the sintering process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Take 100g of NiCrSiB powder with a particle size of 140-320 mesh; take graphite and titanium powder as raw materials for in-situ TiC generation. Titanium powder has a particle size of 200 mesh and a purity of 99.9%. The graphite powder has a particle size of 200 mesh and has a purity of 99.9%. Use Q235 steel. Graphite and titanium powder are mixed with NiCrSiB powder by ball milling to increase the reactivity of the two powders. The ball milling is carried out on the QM-SB planetary ball mill. The ball milling media and ball milling tanks are all ceramic. The ball milling media are three kinds of balls with diameters of 18mm, 8mm and 4mm. In the experiment, the titanium powder and graphite powder were mixed at a molar ratio of 1:1, the ball-to-material ratio was 10:1, and the ratio of different balls was 1:1:1, and the prepared powder was put into a ball mill tank. With absolute ethanol as the ball mill control agent, the ethanol level is 5-7mm higher than the ball and powd...

example 2

[0018] Take 100g of NiCrSiB powder with a particle size of 140-320 mesh; take graphite and titanium powder as raw materials for in-situ TiC generation. Titanium powder has a particle size of 200 mesh and a purity of 99.9%. The graphite powder has a particle size of 200 mesh and has a purity of 99.9%. Use 45 gauge steel. The molar ratio of Ti and C is x(Ti): x(C) = 1:1, that is, the mass ratio is w(Ti): w(C) = 47.90:12. After the two are mixed, the ratio is 15%. It is mixed with NiCrSiB powder, mixed evenly with cellulose acetate acetone solution and adjusted into a paste, and coated on the surface of No. 45 steel with a coating thickness of about 1.2mm, and dried in the air at room temperature. Single-channel scanning with transfer arc plasma scanning equipment, working current is 170A, working voltage is 24V, Ar is used as protection and ionization gas, and the flow of protection gas is 1m 3 / h, the ionized gas flow rate is 0.8m 3 / h, the distance between the nozzle and the workp...

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Abstract

The invention discloses a TiC / metal composite fusing coating producing method for original position controlled by plasma, which comprises the following steps: allocating precoating material; allocating graphite and titanium powder with ferric base or nickel base or cobalt base powder according to the chemical metering rate of TiC as precoating paint; blending organic adhesive evenly through two-step method or synchronous powder sending method; coating composite material on the metal surface; scanning the metal surface continuously of precoating composite paint through plasma; fusing to obtain continuous or single-way fusing layer on the metal surface.

Description

Technical field [0001] The invention relates to a method for generating a TiC / metal composite cladding layer by plasma control in situ, and belongs to the technical field of metal heat treatment (surface). Background technique [0002] The rapid development of modern industry requires many parts and components to work stably for a long time under the conditions of high temperature, high pressure, high speed or high automation, which puts forward higher and higher requirements for the performance of materials. The use of high-alloy and overall heat treatment to make the performance of the parts meet the requirements of use often greatly increases the cost. Because the wear and corrosion of materials only occur on the surface, surface engineering technology is used to generate a layer of excellent performance and strong bonding with the substrate on the surface of the metal material, so that the surface has high hardness, high wear resistance and corrosion resistance, both It satis...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 吴玉萍林萍华胡俊华曹明
Owner HOHAI UNIV
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