Method for preparing fine-grain high-density TZM (Titanium-Zirconium-Molybdenum Allo) alloy

A dense and alloy technology, applied in the field of preparing fine-grained high-density TZM alloys, can solve the problems affecting the mechanical properties of TZM alloys, low alloy density, large porosity, etc., to solve the problems of difficult control of uniformity, uniform distribution, and improved effect of density

Inactive Publication Date: 2012-07-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the problems in the preparation technology of TZM alloys are coarse grains, large porosity, and low alloy density, which affect the mechanical properties of TZM alloys.

Method used

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  • Method for preparing fine-grain high-density TZM (Titanium-Zirconium-Molybdenum Allo) alloy
  • Method for preparing fine-grain high-density TZM (Titanium-Zirconium-Molybdenum Allo) alloy
  • Method for preparing fine-grain high-density TZM (Titanium-Zirconium-Molybdenum Allo) alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Raw materials: molybdenum powder particle size 2μm, TiH 2 Powder and ZrH 2 The particle size of the powder is 5 μm, the particle size of the graphite powder is 10 μm, La 2 o 3 The particle size of the powder is 0.5 μm.

[0034] Prepare alloy powder according to the following mass percentage: TiH 2 : 0.45%, ZrH 2 : 0.06%, graphite powder: 0.05%, La 2 o 3 Powder is 0.5%, and molybdenum powder makes up 100%;

[0035] Put the alloy powder into a three-dimensional blender according to the formula and mix for 2 hours, the speed of the blender is 30r / min, to obtain evenly mixed alloy powder.

[0036] Put the mixed alloy powder into a ball mill for ball milling. The ball mill speed is 50r / min. Molybdenum balls with a diameter of 10mm are placed in the ball mill. The mass ratio of molybdenum balls to alloy powder is 2:1, and the ball milling time is 2 hours.

[0037] The alloy powder after ball milling is formed by compression molding, the pressure is 50Mpa, and the hold...

Embodiment 2

[0041] Raw materials: molybdenum powder with particle size of 3.5μm, TiH 2 and ZrH 2 The particle size of the powder is 8 μm, the particle size of the graphite powder is 6 μm, La 2 o 3 The powder particle size is 0.5 μm.

[0042] Prepare alloy powder according to the following mass percentage: TiH 2 : 0.65%, ZrH 2 : 0.14%, graphite powder: 0.06%, La 2 o 3 Powder: 1.5%, molybdenum powder makes up 100%;

[0043] Put the prepared alloy powder into a three-dimensional blender and mix for 4 hours, the speed of the blender is 60r / min, to obtain a uniformly mixed alloy powder.

[0044]Put the mixed alloy powder into a ball mill for ball milling. The ball mill speed is 200r / min. Molybdenum balls with a diameter of 10mm are placed in the ball mill. The mass ratio of molybdenum balls to alloy powder is 2:1, and the ball milling time is 24 hours.

[0045] The alloy powder after ball milling was formed by isostatic pressing with a pressure of 200Mpa and a holding time of 60s.

[...

Embodiment 3

[0049] Raw materials: molybdenum powder particle size 3μm, TiH 2 and ZrH 2 The particle size of the powder is 7μm, the graphite powder particle size is 8μm, La 2 o 3 The powder particle size is 1 μm.

[0050] Prepare alloy powder according to the following mass percentage: TiH 2 : 0.5%, ZrH 2 : 0.09%, graphite powder: 0.05%, La 2 o 3 Powder: 1%, molybdenum powder makes up 100%.

[0051] Put the prepared alloy powder into a three-dimensional blender and mix for 3 hours, and the speed of the blender is 50r / min, to obtain a uniformly mixed alloy powder.

[0052] Put the mixed alloy powder into a ball mill for ball milling. The ball mill speed is 100r / min. Molybdenum balls with a diameter of 10mm are placed in the ball mill. The mass ratio of molybdenum balls to alloy powder is 2:1, and the ball milling time is 24 hours.

[0053] The ball-milled powder is pressed into shape by molding method, the pressure is 100Mpa, and the holding time is 30s.

[0054] Then pre-sinter th...

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Abstract

The invention discloses a method for preparing a fine-grain high-density TZM (Titanium-Zirconium-Molybdenum Allo) alloy. The method disclosed by the invention comprises the following steps of: with pure molybdenum powder, ZrH2 powder, La2O3 powder and graphite powder as raw materials, mixing the raw materials, and carrying out ball milling, press molding, presintering and high-temperature sintering to obtain the TZM alloy. The TZM alloy prepared by using the method disclosed by the invention has the characteristics of fine crystal grains, distribution uniformity, low porosity, high compactness, simple preparation process and strong operability and controllability and has the most remarkable advantages that: on the basis of the traditional ZTM alloy preparation method, rare earth oxide La2O3 is solid-solid doped in the alloy powders, a mode of combining mixing and ball-milling of the alloy powders and a mode of sectional sintering during high-temperature sintering are adopted, crystal grains are fined, the alloy density is remarkably improved, the sintering temperature of the TZM alloy is reduced to 1800-2000 DEG C from 2100-2300 DEG C in the traditional method, therefore energy resources are saved and requirements of an enterprise on the fine-grain TZM alloy material with high density can be met.

Description

technical field [0001] The invention belongs to the field of preparing refractory metal alloys by powder metallurgy, and relates to the preparation of TZM alloys, in particular to a method for preparing fine-grained high-density TZM alloys. Background technique [0002] Molybdenum alloy is a non-ferrous alloy composed of molybdenum as the matrix and other elements. Due to its excellent high-temperature mechanical properties, molybdenum alloys represented by TZM (Titanium-Zirconium-Molybdenum Allo) can be widely used in the aerospace industry, nuclear energy industry, and electronics industry. At present, TZM alloys are mainly prepared by melting method and powder metallurgy method. The smelting method is to smelt pure molybdenum and a certain amount of Ti, Zr and other elements under the protection of vacuum or inert gas, and then use casting and machining to make TZM blanks. The powder metallurgy method is to use high-purity molybdenum powder and TiH 2 Powder, ZrH 2 Pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/04
Inventor 王快社王鹏洲张郑胡平张兵康轩齐何欢承
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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