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A kind of preparation method of zirconium compound doped high-temperature corrosion-resistant nickel-based alloy

A nickel-based alloy, corrosion-resistant technology, applied in the field of alloys, can solve the problems of alloy performance and corrosion resistance reduction, hardenability, fracture toughness, corrosion and other problems, to improve service performance and life, excellent durability Alkali corrosion performance, the effect of simple process

Active Publication Date: 2018-05-18
SANXIANG ADVANCED MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing corrosion-resistant alloys can maintain a certain corrosion resistance in a low-temperature environment, when the temperature rises above 500 ° C, especially in a strong alkaline environment, grain boundary corrosion will occur, resulting in alloy physics. The performance and corrosion resistance decrease rapidly, and when it is used again in a high-temperature alkaline environment, it will accelerate the corrosion of the alloy body and can no longer be used
The commonly used nickel-based alloy preparation method also has literature mentioning the zirconium doping process, such as the patent No. CN102628127A, the Chinese invention patent named "high-strength corrosion-resistant nickel alloy and its manufacturing method", but it uses metal zirconium as raw material, and the raw material cost High, elemental zirconium and nickel matrix are also difficult to fuse, resulting in cracks or even fractures in alloy products. At the same time, zirconium in the alloy is dispersed in the nickel-based alloy in the form of metal zirconium, which affects the properties of the added nickel-based alloy materials such as hardenability, The impact of fracture toughness and other factors is great, and the corrosion resistance in high temperature and strong alkali environment is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Raw material preparation: take the raw material according to the weight ratio of nickel: chromium: zirconia: vanadium oxide: carbon=64.5: 33.5: 1.2: 0.59: 1.6, wherein the purity of metallic nickel is more than or equal to 99.9%, the purity of metallic chromium is more than or equal to 99.9%, The purity of zirconia ≥ 99.8%, the purity of vanadium ≥ 99.8%, and the purity of carbon ≥ 99%. Zirconia, vanadium oxide and carbon are preferably granular or powdery, and zirconia, vanadium oxide and carbon are mixed and pressed into pellets (balls The diameter is 0-30mm, and the pressure ball makes the contact sufficient to make the thermal reduction reaction more efficient).

[0022] 2. Melting: Put nickel and chromium into the vacuum induction furnace for smelting, control the melting temperature of the vacuum induction furnace to 1650°C, after the nickel and chromium are melted, then mix and press the pellets made of zirconia, vanadium oxide and carbon Throw it into a vacuu...

Embodiment 2

[0028] 1. Raw material preparation: take the raw material according to the weight ratio of nickel: chromium: zirconia: vanadium oxide: carbon=66.75: 30.3: 0.993: 0.845: 1.55, wherein, the purity of metallic nickel is more than or equal to 99.9%, the purity of metallic chromium is more than or equal to 99.9%, The purity of zirconia ≥ 99.8%, the purity of vanadium ≥ 99.8%, and the purity of carbon ≥ 99%. The zirconia, vanadium oxide and carbon are preferably granular or powdery, and the zirconia, vanadium oxide and carbon are mixed and pressed into pellets.

[0029] 2. Melting: Put nickel and chromium into the vacuum induction furnace for smelting, control the melting temperature of the vacuum induction furnace to 1600°C, after the nickel and chromium are melted, then mix and press the pellets made of zirconia, vanadium oxide and carbon Throw it into a vacuum induction furnace for smelting, control the smelting time after the pellets are put into the vacuum induction furnace to b...

Embodiment 3

[0035] 1. Raw material preparation: take the raw material according to the weight ratio of nickel: chromium: zirconia: vanadium oxide: carbon=63.5: 27.5: 0.85: 0.55: 1.15, wherein, the purity of metallic nickel is more than or equal to 99.9%, the purity of metallic chromium is more than or equal to 99.9%, The purity of zirconia ≥ 99.8%, the purity of vanadium ≥ 99.8%, and the purity of carbon ≥ 99%. The zirconia, vanadium oxide and carbon are preferably granular or powdery, and the zirconia, vanadium oxide and carbon are mixed and pressed into pellets.

[0036] 2. Melting: Put nickel and chromium into the vacuum induction furnace for smelting, and control the melting temperature of the vacuum induction furnace to 1550°C. After the nickel and chromium are melted, the balls made of zirconia, vanadium oxide and carbon are mixed and pressed. Throw it into a vacuum induction furnace for smelting, control the smelting time after the pellets are put into the vacuum induction furnace t...

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Abstract

The invention relates to a preparation method of a zirconium compound-doped high-temperature corrosion-resistant nickel-based alloy. The technology of adding zirconium oxide, vanadium oxide and carbon in a certain proportion to the nickel-based alloy is used to realize the carbon dioxide in the high-temperature molten pool under vacuum conditions. React with zirconia and vanadium oxide to form part of zirconium carbon compound and vanadium carbon compound evenly dispersed in the alloy, so that the prepared nickel-based alloy maintains good strength at high temperature and has excellent alkali corrosion resistance. The process is simple and the process is simple. The cost is low, and the prepared alloy can be used for a long time in a corrosive environment at a high temperature of 1000°C. It has the characteristics of high temperature resistance and alkali corrosion resistance, and can be widely used in various high temperature anti-corrosion industry equipment accessories to improve its performance and service life.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a method for preparing a zirconium compound-doped high-temperature corrosion-resistant nickel-based alloy. Background technique [0002] As the chemical industry has more and more stringent requirements for corrosion resistance, especially the performance of equipment materials that can withstand strong alkali corrosion in high temperature environments, the preparation technology of corrosion-resistant alloys has always been a hot spot in the field of alloy research. Although the existing corrosion-resistant alloys can maintain a certain corrosion resistance in a low-temperature environment, when the temperature rises above 500 ° C, especially in a strong alkaline environment, grain boundary corrosion will occur, resulting in alloy physics. The performance and corrosion resistance are rapidly reduced, and when it is used in a high-temperature alkaline environment again, it will ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C19/05C22C32/00
CPCC22C1/1036C22C19/058C22C32/001C22C32/0031C22C32/0084C22C1/1047
Inventor 包晓刚叶旦旺韩双林李小毅张先贵
Owner SANXIANG ADVANCED MATERIALS
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