Cobalt-chromium-nickel alloy material and powder metallurgy preparation method thereof

A nickel alloy and cobalt-chromium technology, which is applied in the preparation of cobalt-chromium-nickel alloy materials based on powder metallurgy methods and the law of microstructure evolution, cobalt-chromium-nickel alloy materials and the field of powder metallurgy preparation, can solve the problem of high damage wave, unexamined and applied , It does not have the ability to extrude large-size bars of powder superalloy, and achieve the effects of cost saving, short sintering time and easy preparation process.

Active Publication Date: 2018-08-14
湖北麦拓新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country began to develop powder superalloys in the 1980s. Although the performance of the developed powder superalloys meets the requirements of international standards, it has not been assessed and applied because the ultrasonic flaw detection inclusions (inclusions axial accumulation) damage wave is higher than the American standard.
Moreover, my country currently does not have large-scale isothermal forging equipment capable of extrusion blanking of large-size powder superalloy bars and inert gas (or vacuum) protection. The lack of key equipment has become an extrusion + isothermal forging process route for powder superalloy development. and production bottlenecks

Method used

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  • Cobalt-chromium-nickel alloy material and powder metallurgy preparation method thereof
  • Cobalt-chromium-nickel alloy material and powder metallurgy preparation method thereof
  • Cobalt-chromium-nickel alloy material and powder metallurgy preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Negative pressure dewaxing and vacuum sintering integrated process method preparation process.

[0036] The first is the preparation of the mixture: mix the two components according to the weight ratio of 62% Co-32% (Cr+Ni)-7% (Mo+Fe)-0.1C, the chromium-nickel weight ratio of component 1 is 10, the composition The weight ratio of chromium to nickel is 3; the steel ball is used as the grinding ball, the ball-to-material ratio is 10:1, and absolute ethanol is used as the ball-milling medium, and the amount of absolute ethanol is 2:1 for the alcohol-to-material ratio; Type ball mill for mixing, rotating speed 200r / min, forward and reverse for 20min, time 48h, after obtaining the mixture, dry it in an oven at 80°C and mix it with forming agent, the amount of paraffin wax added as forming agent is 6%, and granulate with 80-mesh stainless steel screen .

[0037] Then use 500MPa pressure on the molding machine to press the strip-shaped sample, dewax it at a temperature below ...

Embodiment 2

[0040] Negative pressure dewaxing pre-sintering and low vacuum sintering process

[0041] The preparation and compression molding process of the mixture are the same as in Example 1. The pressed compact is dewaxed under negative pressure. The carrier gas during dewaxing is argon, and the pressure of the furnace carrier gas is 300-400Pa. After the dewaxing process at 600°C, it is cooled to room temperature with the furnace. The dewaxing sintering process curve is as follows Figure 5 shown. Then carry out low-vacuum sintering, and the vacuum degree in the furnace is kept within 2 Pa during the heating stage, and the cooling process process control after sintering is the same as that in Example 1. Figure 6 It is the process curve of the vacuum sintering stage. After testing, the morphology and properties of components 1 and 2 have not changed significantly. Component 1 is a single-phase ε-hcp alloy, and component 2 is a dual-phase α-fcc, ε-hcp alloy; their hardnesses are res...

Embodiment 3

[0043] Low pressure sintering process

[0044] The preparation and compression molding process of the mixture are the same as in Example 1. The pressed compact is dewaxed under negative pressure, and the dewaxing process is the same as in Example 2. The sintering process adopts low-pressure sintering, and the sintering process curve is as follows: Figure 7 As shown, the temperature below 1300°C adopts low vacuum sintering process, the vacuum degree of the furnace is kept below 2Pa, the sintering temperature range of 1300°C is sintered in low vacuum for 20min, and then filled with pressure gas, the pressure gas is argon, and the inflation speed is 0.2MPa / min to Furnace pressure 4MPa, pressure sintering at 4MPa for 20min, keep the furnace pressure to cool down during the sintering temperature to 700°C cooling stage, and rapidly cool to room temperature at 700°C, the cooling rate is 5-6°C / min. The test results show that there is no significant change in the morphology and prop...

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Abstract

The invention discloses a cobalt-chromium-nickel alloy material and a powder metallurgy preparation method thereof. The cobalt-chromium-nickel alloy material is prepared from Co-Cr-Ni-M-C original powder, wherein M is selected from one or more of Mo, W, Fe, Si and Mn. In the preparation process of the cobalt-chromium-nickel alloy material, negative-pressure dewaxing is carried out in advance, andsinter molding is carried out in a low-vacuum sintering manner within a sintering temperature range. The scheme that single-phase epsilon-hcp Co alloy and double-phase alpha-fcc and epsilon-hcp Co alloy are obtained through the powder metallurgy method by adjusting the content of the original material component Ni is given.

Description

technical field [0001] The invention relates to the fields of mechanical processing and powder metallurgy, in particular to a cobalt-chromium-nickel alloy material and a powder metallurgy preparation method thereof, a cobalt-chromium-nickel alloy material prepared based on a powder metallurgy method and its microstructure evolution law. Background technique [0002] Cobalt-chromium-nickel alloy has excellent mechanical properties, wear resistance and biocompatibility, and can be used in dentistry, artificial joint connectors, etc. In addition, cobalt-chromium-nickel alloys also have high high-temperature strength, anti-adhesion and resistance to various forms of corrosion, and are widely used in chemical, oil and gas equipment, gas turbines, aviation and steel industries. [0003] High-cobalt series cobalt-chromium alloys are usually processed by casting or hot forging after casting. Most of the preparation techniques are too complicated, the process control is difficult, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/04
CPCC22C1/0433C22C19/07
Inventor 石增敏余永言张大勇
Owner 湖北麦拓新材料科技股份有限公司
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