Diamond-iron based composite coating and application thereof as sealing layer of high-temperature valve

A composite coating, diamond technology, applied in metal material coating process, coating, metal processing equipment and other directions, can solve problems such as high requirements for service life and safety, loss of valve function, and impact on enterprise production efficiency. , to achieve the effect of good hardenability, extended service life and high hardness

Active Publication Date: 2020-06-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of the valve, under high temperature and high fluid pressure, the valve is often opened and closed. Due to the mutual friction, extrusion, shearing between the sealing surfaces, as well as the erosion and corrosion of the fluid, the sealing surface It is very vulnerable to damage. Once the sealing surface is damaged, the valve will leak, and the valve will lose its function and become a waste product.
The replacement of valves will seriously affect the production efficiency of enterprises, especially for valves working in special environments such as electric power and boilers, which require long-term service without replacement, and have high requirements for service life and safety.
[0003] At present, high-temperature valves are mainly made of stainless steel such as 201, 304, or a layer of alloy with special properties is surfacing on the sealing surface of the valve. These valves have good corrosion resistance under normal conditions, but in some high-temperature, high-pressure, When working in a special environment with corrosive media, it is easy to be corroded, the life is shortened, the sealing performance is reduced, and it is easy to cause a large amount of resource loss and resource waste, and even serious accidents

Method used

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  • Diamond-iron based composite coating and application thereof as sealing layer of high-temperature valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The ingredients of this embodiment are shown in Table 1.

[0030] 1. Preparation of pre-coated diamond powder

[0031] Evenly mix diamond with Ti powder and Hf powder (more than 99% of purity), put into a sealed quartz test tube, and vacuumize to 10 -3 Pa, then place the test tube in a resistance furnace and heat it to 900°C for 1 hour, then use a 200-mesh standard sieve to separate diamond from Ti powder and Hf powder to obtain pre-coated diamond powder. The quality of the alloy layer accounts for 21%-40% of the mass of the pre-coated diamond powder.

[0032] 2. Plasma spray welding

[0033] The iron-based self-dissolving alloy powder and the pre-coated diamond powder are fed separately, and coated on the surface of the steel substrate by plasma spray welding to form a composite cladding layer, which is combined with the steel substrate.

[0034] Surfacing welding process parameters are as follows: current 150A, walking speed 70mm / min, swing frequency 22min -1 , sw...

Embodiment 2

[0036] The ingredients of this embodiment are shown in Table 1.

[0037] 1. Preparation of pre-coated diamond powder

[0038] Evenly mix the diamond with Ti and Hf powder (more than 99% in purity), put it into a sealed quartz test tube, and evacuate to 10 -3Pa, then place the test tube in a resistance furnace and heat it to 900°C for 1 hour, then use a 200-mesh standard sieve to separate diamond from Ti and Hf powder to obtain pre-coated diamond powder. The mass of the transition layer accounts for 21%-40% of the mass of the pre-coated diamond powder.

[0039] 2. Plasma spray welding

[0040] The iron-based self-dissolving alloy powder and the pre-coated diamond powder are separately fed and coated on the surface of the steel substrate by plasma spray welding to form a composite cladding layer, which is combined with the steel substrate.

[0041] Surfacing welding process parameters are as follows: current 150A, walking speed 70mm / min, swing frequency 22min -1 , swing widt...

Embodiment 3

[0043] The ingredients of this embodiment are shown in Table 1.

[0044] The preparation method of this embodiment is the same as that of Example 2. The mass of the transition layer accounts for 21%-40% of the mass of the pre-coated diamond powder.

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Abstract

The invention discloses a diamond-iron based composite coating and application thereof as a sealing layer of a high-temperature valve. The diamond-iron based composite coating is prepared from the following raw materials in percentage by mass: 30%-35% of pre-coated diamond powder, 0.6%-0.8% of C, 18%-25% of Cr, 3%-5% of B, 2%-4% of Si, 3.0%-4.0% of other metal and nonmetal elements, and the balance of Fe. The high-temperature value adopting the diamond-iron based composite coating as the sealing layer has good heat conduction, sealing property, wear resistance and corrosion resistance.

Description

technical field [0001] The invention relates to a diamond-iron-based composite coating and its application as a sealing layer for high-temperature valves. Background technique [0002] With the improvement of industrial level, the demand for valves is increasing, and the requirements for valves are becoming more and more stringent, requiring valves to have better thermal conductivity, wear resistance and sealing performance. For some valves working in special environments with high temperature, high pressure and corrosive media, good corrosion resistance is also required. Among the many factors that cause valve failure, wear is one of the most important reasons, often causing serious economic losses to enterprises, and sometimes even serious safety accidents. The part of the valve that is most likely to wear is the sealing surface of the valve. The sealing surface is one of the most important working parts of the valve. The quality of the sealing surface is directly related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/134C22C26/00C22C30/00B22F1/02C23C24/10
CPCC23C4/06C23C4/134C22C26/00C22C38/32C22C38/34C22C30/00C22C38/28C22C38/002C23C24/103C22C2026/006B22F1/17
Inventor 杜晓东王赛龙胡荣祥孙建付俊伟
Owner HEFEI UNIV OF TECH
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