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Method for preparing reinforced molybdenum alloy

A molybdenum alloy and alloy technology, applied in the field of preparation of strengthened molybdenum alloy, can solve the problems of increased difficulty of alloy deformation, decreased material performance, plastic deformation equipment and high cost, and achieve the effect of increasing the content

Inactive Publication Date: 2007-05-16
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although TZC alloys and MHC alloys have the strength and hardness to meet high-temperature performance, one of the disadvantages of these alloys is that due to the high hardness and strength of the alloys, it is very difficult to perform plastic deformation processing, and the equipment and cost required for plastic deformation are very high. High; the second shortcoming of this type of alloy is that the mixing of the original powder of the alloy adopts the method of solid-solid mixture, for example, Ti and Zr are added in the form of hydride, and carbon is added in the form of carbon black. The specific gravity of the powder has a large difference, so even after a long time of mixing, it is difficult to mix evenly, resulting in uneven distribution of the strengthening phase in the molybdenum matrix and a decrease in the performance of the material
The third disadvantage of this method is that since Ti and Zr are added in the form of hydrides, the corresponding hydrides are easy to form oxides, which further increases the difficulty of alloy deformation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 100Kg of molybdenum powder (the particle size of the molybdenum powder is 3.2um), add 2660g of chemically pure titanium dioxide and 920g of carbon black into the three-dimensional mixer, and mix for 5 hours. The mixed powder is cold isostatic pressed, and then sintered at 1850°C in a hydrogen atmosphere furnace.

[0016] The microstructure of the sintered compact shows that TiC is uniformly dispersed in the molybdenum matrix. The alloy is processed into a copper alloy die-casting core rod by high-temperature forging. It has been used for 15,000 times, and the dimensional accuracy can still meet the process requirements. There are no defects such as cracks, and the use effect is good.

Embodiment 2

[0018] Weigh 100Kg of molybdenum powder (the particle size of the molybdenum powder is 3.2um), add 2677g of chemically pure titanium dioxide and 1200g of carbon black into the three-dimensional mixer, and mix for 5 hours. The mixed powder is cold isostatic pressed, and then sintered at 1850°C in a hydrogen atmosphere furnace.

[0019] The microstructure of the sintered compact shows that TiC is uniformly dispersed in the molybdenum matrix. The alloy is processed into a copper alloy die-casting core rod by high-temperature forging, and has been used for more than 15,000 times. The dimensional accuracy can still meet the process requirements, and there are no defects such as cracks, and the use effect is good.

Embodiment 3

[0021] Weigh 100Kg of molybdenum powder (the particle size of the molybdenum powder is 3.2um), add 3332g of chemically pure titanium dioxide and 1500g of carbon black into the three-dimensional mixer, and mix for 5 hours. The mixed powder is cold isostatic pressed, and then sintered at 1850°C in a hydrogen atmosphere furnace.

[0022] The microstructure of the sintered compact shows that TiC is uniformly dispersed in the molybdenum matrix.

[0023] The sintered bar is heated to 1550°C and extruded with an extrusion ratio of 6:1. After the extruded rod is annealed, it is processed into a copper alloy die-casting core rod. It has been used more than 17,000 times, and the dimensional accuracy still meets the requirements. The core rod is not broken or has surface cracks, and the use effect is good.

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PUM

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Abstract

The invention discloses a preparing method of strengthening molybdenum alloy of pressing mould, inlaid and squeezing mould of copper, other alloys and black metal, which is characterized by the following: adopting TiC as strengthening phase of molybdenum alloy; adding Ti at TiO2 pattern and carbon at carbon black pattern; reducing TiO2 into TiC under high temperature; obtaining the product with high-temperature strength and superior high-temperature abrasion-proof property.

Description

technical field [0001] The invention discloses a method for making strengthened molybdenum alloys, relating to a method for preparing molybdenum alloys for die-casting dies, inserts and extrusion dies of copper and its alloys and ferrous metals. Background technique [0002] Molybdenum and its alloys have the characteristics of high melting point, high high temperature strength, and high elastic modulus, and are widely used in high temperature heating, glass melting, high temperature structural supports, etc. In order to improve the high-temperature strength and recrystallization temperature of molybdenum, alloying and second-phase dispersion strengthening are commonly used methods at present, and the carbide-strengthened molybdenum alloy has the characteristics of high high-temperature strength and high-temperature hardness. For example, TZM alloy containing 0.4-0.55% Ti, 0.06-0.12% Zr, 0.01-0.04% C, TZC alloy containing 1.25% Ti, 0.15-0.5% Zr, 0.15-0.3% C, and MHC alloy st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C45/10B22F3/16
Inventor 都业志
Owner JINDUICHENG MOLYBDENUM CO LTD
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