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Ni3(Si,Ti)-WC composite coating material and preparation method thereof

A composite coating and coating material technology, applied in the coating, metal material coating process, manufacturing tools, etc., can solve the problems of composite material performance degradation, etc., to achieve good bonding, high hardness, high temperature resistance to sulfide corrosion and Excellent erosion performance

Inactive Publication Date: 2008-04-16
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a nickel-three-silicon-titanium intermetallic compound coating material and its preparation method, to solve the problem of the decline in the performance of the composite material due to the peeling off of the external ceramics, and to combine the advantages of laser cladding and in-situ synthesis technology Combined together, laser cladding on the nickel-based superalloy substrate to prepare Ni 3 Composite coating composed of (Si, Ti) intermetallic compound, Ni-based solid solution, and TiC-coated WC ceramics

Method used

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  • Ni3(Si,Ti)-WC composite coating material and preparation method thereof
  • Ni3(Si,Ti)-WC composite coating material and preparation method thereof
  • Ni3(Si,Ti)-WC composite coating material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Ni powder, Si powder and Ti powder are proportioned according to the atomic percentage of Ni78Si13Ti9; WC particles with a weight percentage of 8wt% are added; in addition, 5 ppm of B powder is added.

[0019] (2) The purity of Ni powder, Si powder and Ti powder is greater than 99%, and the particle size of the powder is 100-300 mesh.

[0020] (3) Put the mixed powder into a mortar, grind and mix evenly, and then dry it as a coating material. Laser multi-layer and multi-pass cladding is carried out in the way of pre-set powder.

[0021] (4) The laser process parameters are: output power 1200-1300W, scanning speed 4-8mm / s, spot diameter 4mm, each overlap 1.8mm.

[0022] The prepared cladding layer has a thickness of about 1.0mm, a Vickers hardness of 480Hv, and a ceramic phase volume fraction of 3%, such as figure 1 As shown, the main structure of the coating is Ni 3 (Si, Ti) intermetallic compounds, Ni(Si) solid solution and a small amount of irregular block WC a...

Embodiment 2

[0024] (1) The ratio of Ni powder, Si powder and Ti powder is Ni78Si13Ti9 according to the atomic percentage; WC particles with a weight percentage of 15 wt% are added; in addition, 5 ppm of B powder is added.

[0025] (2) The purity of Ni powder, Si powder and Ti powder is greater than 99%, and the particle size of the powder is 100-300 mesh.

[0026] (3) Put the mixed powder into a mortar, grind and mix evenly, and then dry it as a coating material. Laser multi-layer and multi-pass cladding is carried out in the way of pre-set powder.

[0027] (4) The laser process parameters are: output power 1300-1400W, scanning speed 4-6mm / s, spot diameter 4mm, each overlap 1.8mm.

[0028] The prepared cladding layer has a thickness of about 1.0mm, a Vickers hardness of 520Hv, and a ceramic phase volume fraction of 6%, such as figure 2 As shown, the main structure of the coating is Ni 3 (Si, Ti) intermetallic compound, Ni(Si) solid solution and petal-shaped TiC / WC composite ceramic ph...

Embodiment 3

[0030] (1) The ratio of Ni powder, Si powder and Ti powder is Ni78Si13Ti9 by atomic percentage; 20 wt% of WC particles are added; in addition, 5 ppm of B powder is added.

[0031] (2) The purity of Ni powder, Si powder and Ti powder is greater than 99%, and the particle size of the powder is 100-300 mesh.

[0032] (3) Put the mixed powder into a mortar, grind and mix evenly, and then dry it as a coating material. Laser multi-layer and multi-pass cladding is carried out in the way of pre-set powder.

[0033] (4) The laser process parameters are: output power 1400-1500W, scanning speed 4-6mm / s, spot diameter 4mm, each overlap 1.8mm.

[0034] The prepared cladding layer has a thickness of about 1.0mm, a Vickers hardness of 540Hv, and a ceramic phase volume fraction of 12%, such as image 3 As shown, the main structure of the coating is Ni 3 (Si, Ti) intermetallic compound, Ni(Si) solid solution, irregular WC and petal-like TiC coated WC composite ceramic phase.

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Abstract

The present invention relates to a laser cladding nickel silicon titanium - tungsten carbide composite coating material and a method for preparation the same; the propose of the invention is to prepare a composite coating consisting of intermetallic compound of Ni3 (Si, Ti), a Ni-based solid solution, TiC coated WC ceramic on a high-temperature ultratek substrate by laser cladding; the coating material mainly comprises Ni powder, Si powder, Ti powder and WC powder with the following weight percentages: 8 percent to 20 percent WC, 78 percent Ni, 13 percent Si and 9 percent Ti; the preparation method adopts the laser to clad and has the following technique parameters: the output power is between 1200 W and 1500 W; the scanning speed is 4-8 mm / s; the spot diameter is 4 mm; the protective gas is Ar gas in cladding; the cladding substrate material is high-temperature ultratek; the invention has the following procedures: according to the mixing ratio, the coating material is mixed uniformly and pre-coated or hot-sprayed on the surface of the high-temperature ultratek substrate with the thickness between 0.8 mm and 1.0 mm; the laser scans cladding with multilayer and multi-path; each path has related joint of 1.8 mm, thereby achieving the cladding layer with different thickness.

Description

technical field [0001] The invention relates to a nickel-silicon-titanium-tungsten carbide composite coating material for laser cladding and a preparation method thereof, in particular to a nickel-silicon-titanium intermetallic compound reinforced by an external ceramic phase and an in-situ generated ceramic phase. The invention relates to a compound coating material and a laser cladding preparation method thereof, which belong to the field of synthesis and coating preparation of intermetallic compound-based composite materials. Background technique [0002] Intermetallic Ni 3 Si has strength-temperature abnormal effect, high medium temperature strength and excellent corrosion resistance. It has excellent corrosion resistance in acidic solution, oxidative corrosion medium, sea water, ammonia water and other media. Ti element can be used to further alloy it To improve its performance (T.Takasugi, M.Nagashima, O.Izumi, Strengthening and ductilization of Ni 3 Si by the additi...

Claims

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Application Information

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IPC IPC(8): C23C24/10C23C30/00B23K26/34
Inventor 樊丁张建斌孙耀宁孙明
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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