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Nickel and silicon intermetallic compound based composite coat making method

An intermetallic compound and composite coating technology, applied in the field of surface engineering, can solve the problems of long production cycle, high equipment requirements, complex process, etc., and achieve the effects of short production cycle, low cost and simple process

Inactive Publication Date: 2014-04-16
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have the disadvantages of complex process,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The base material is 20# steel with a diameter of 65 mm, which is ground to a roughness of 0.07 μm and cleaned with ultrasonic waves before use; 3 Si raw reaction powder 35 g, and Cr 7 C 3 The original reaction powder was 30 g, and the two reaction powders were ball milled to an average particle size of about 20 μm. Lay nickel powder on the surface of the base steel block as a wetting phase, according to the nickel powder layer, Ni 3 Si original reaction powder layer, Cr 7 C 3 The original reaction composite powder layer stacks the reaction materials from bottom to top, then puts them into the mold and compacts them with a pressure of 30 MPa. Put the pre-pressed reaction embryo into the reaction vessel to heat and degas, and at the same time pass through 5 MPa argon, heat to 250 °C, and use the igniter to initiate the self-propagating reaction. After the reaction was completed, the coating was air-cooled to room temperature with the reaction vessel to remove impuri...

Embodiment 2

[0021] The base material is 20# steel with a diameter of 90 mm, which is ground to a roughness of 0.07 μm and cleaned with ultrasonic waves before use; 3 Si raw reaction powder 60 g, and Cr 7 C 3 The original reaction powder was 60 g, and the two reaction powders were ball milled to an average particle size of about 20 μm. Preparation process and technology are the same as embodiment 1, and the prepared coating Cr 7 C 3 The mass fraction is about 28.3%, the hardness is 9.74 GPa, and the wear rate is 1.50×10 -6 mm 3 / Nm.

Embodiment 3

[0023] The base material is 20# steel with a diameter of 50 mm, which is ground to a roughness of 0.07 μm and cleaned by ultrasonic waves before use; 3 Si raw reaction powder 14 g, and Cr 7 C 3 The original reaction powder was 17 g, and the two reaction powders were ball milled to an average particle size of about 20 μm. Preparation process and technology are the same as embodiment 1, and the prepared coating Cr 7 C 3 The mass fraction is about 32.4%, the hardness is 10.37 GPa, and the wear rate is 1.01×10 -6 mm 3 / Nm.

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Abstract

The invention discloses a nickel and silicon intermetallic compound based composite coat making method. An Ni3Si-Cr7C3 composite coat is made on the surface of common carbon steel through a high pressure self propagating reaction, the above obtained reaction product is molten by high heat released in the reaction, and metallurgical combination of the molten target product and a steel substrate is carried out to make an intermetallic ceramic composite coat having a high combination strength on the steel substrate. The coat can be applied to corrosion resistant blades, inner walls of corrosion and high temperature resistant pipelines and reactors, and acid/high temperature wear resistant parts.

Description

technical field [0001] The invention relates to a preparation method of a hard ceramic reinforced intermetallic compound-based composite coating, which belongs to the technical field of surface engineering. Background technique [0002] Nickel silicon intermetallic compound (Nickel silicide) has the advantages of high melting point, good high temperature thermal stability, high temperature oxidation resistance, corrosion resistance, wear resistance, etc., so it is a high temperature structural material with great application potential. However, severe room temperature brittleness limits its application as a high-temperature structural material. In the late 1980s, Ni was improved by alloying 3 The room temperature brittleness of Si, this achievement promotes the Ni 3 The application research of Si material lays the foundation for its industrial application. Cr 7 C 3 It has high hardness, high melting point and high elastic modulus, so it can be used as Ni 3 The strength...

Claims

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Application Information

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IPC IPC(8): C23C24/08
Inventor 刘维民毕秦岭牛牧野朱圣宇杨军马吉强
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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