Method for preparing large powder metallurgy TZM blank with uniform carbon and oxygen distribution

A technology of uniform distribution and powder metallurgy, applied in the field of TZM molybdenum alloy billet preparation, to ensure uniformity, reduce initial oxygen content, and uniform pores

Active Publication Date: 2011-01-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
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Problems solved by technology

Therefore, only the vacuum sintering process is not enough to prepare large-scale and high-performance low-oxygen powder metallurgy TZM

Method used

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  • Method for preparing large powder metallurgy TZM blank with uniform carbon and oxygen distribution
  • Method for preparing large powder metallurgy TZM blank with uniform carbon and oxygen distribution

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preparation example Construction

[0041] Such as figure 1 A method for preparing a large-scale powder metallurgy TZM billet with uniform carbon and oxygen distribution includes the following steps:

[0042] Step 1. Weighing raw materials: Weigh titanium hydride powder, zirconium hydride powder, carbon black powder and molybdenum powder respectively. The percentages of the mass in the total mass of the four raw materials are respectively 0.4%-0.55%, 0.06%-0.12%, 0.04%-0.1% and 99.5%-99.23%.

[0043] In the actual preparation process, the molybdenum powder is high-temperature reduced molybdenum powder obtained after high-temperature reduction of high-temperature molybdenum powder raw materials. The high-temperature molybdenum powder raw material is ammonium paramolybdate or ammonium dimolybdate, and the high-temperature reduction temperature is 950 °C to 1300 °C, and the preferred high temperature reduction temperature is 1100 °C to 1200 °C. In actual preparation, other raw materials other than ammonium paramo...

Embodiment 1

[0058] In this example, ammonium paramolybdate was used as the high-temperature molybdenum powder raw material and the molybdenum powder was produced at a high-temperature reduction temperature of 1100°C, and the Fischer particle size of the prepared molybdenum powder was 3.5 μm to 4.8 μm, and the oxygen content was 200 ppm to 500ppm, the selected titanium hydride powder and zirconium hydride powder are all powders obtained by ball milling in a wet stirring ball mill, and 95% by weight of the titanium hydride powder and zirconium hydride powder have a particle size of less than 1 μm.

[0059]In this embodiment, the preparation process of the TZM billet is as follows: Step 1. Weigh 30 kg of molybdenum powder, 150 grams of titanium hydride, 30 grams of zirconium hydride, and 18 grams of carbon black. Step 2, powder mixing: First, mix the weighed titanium hydride powder, zirconium hydride powder and carbon black powder to make a mixed powder, then add 400ml of alcohol to the mixed...

Embodiment 2

[0063] In this embodiment, ammonium dimolybdate is used as the high-temperature molybdenum powder raw material and the molybdenum powder is produced at a high-temperature reduction temperature of 1200° C., and the Fisher particle size of the obtained molybdenum powder is 3.5 μm to 4.8 μm. The oxygen content is 200ppm-500ppm, the selected titanium hydride powder and zirconium hydride powder are all powders obtained by ball milling in a wet stirring ball mill, and 95% by weight of the titanium hydride powder and zirconium hydride powder have a particle size of less than 1 μm.

[0064] In this embodiment, the preparation process of the TZM billet is as follows: Step 1. Weigh 80 kg of molybdenum powder, 400 grams of titanium hydride, 80 grams of zirconium hydride, and 45 grams of carbon black. Step 2, powder mixing: First, mix the weighed titanium hydride powder, zirconium hydride powder and carbon black powder to make a mixed powder, then add 1500ml of alcohol to the mixed powder ...

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Abstract

The invention discloses a method for preparing a large powder metallurgy TZM blank with uniform carbon and oxygen distribution, which comprises the following steps of: 1, weighing raw materials; 2, mixing powder, namely mixing the weighed four raw materials twice under vacuum or the protection of inert gas, mixing titanium hydride powder, zirconium hydride powder and carbon black powder to prepare mixed powder, adding a volatile organic solvent into the mixed powder, uniformly stirring to prepare suspension, adding the weighed molybdenum powder into the suspension for uniform mixing, and adding residual molybdenum powder for uniform mixing; 3, performing cold isostatic pressing; and 4, sintering by keeping the temperature at stages, namely adopting a vacuum sintering furnace and sintering at three stages, wherein the process comprises the following steps of: raising the temperature at the first stage, raising the temperature at the second stage, and sintering at high temperature. The preparation method has the advantages of reasonable design, simple and convenient operation, and good using effect. The carbon content in the center and on the surface of the prepared larger-size TZM blank can be controlled to be approximately consistent, and the oxygen content in the center and on the surface of the TZM blank also can be reduced to a lower level.

Description

technical field [0001] The invention belongs to the technical field of TZM molybdenum alloy blank preparation, and in particular relates to a method for preparing a large-scale powder metallurgy TZM blank with uniform carbon and oxygen distribution. Background technique [0002] TZM molybdenum alloy is a molybdenum alloy commonly used in molybdenum-based alloys. It has excellent high-temperature strength, good electrical conductivity and thermal expansion properties, so it is widely used in high-temperature structural parts, aerospace industry, electronics industry and glass manufacturing industry. . Common preparation methods for TZM molybdenum alloys include arc melting and powder metallurgy. Among them, the arc melting method is to melt pure molybdenum with an electric arc, and then add a certain amount of alloying elements such as titanium and zirconium according to the weight percentage, and then use the conventional casting method to obtain the TZM alloy; while the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16
Inventor 梁静李来平奚正平汤慧萍张新林小辉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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