Die material for copper hot extrusion and preparation process thereof

A mold material and a hot extrusion technology, applied in the field of preparation technology of the copper hot extrusion mold material, can solve the problems of poor toughness and processability, unfavorable industrial production, poor high temperature strength and the like, and improve the cold and heat fatigue resistance. , The effect of improving production efficiency and thermal conductivity

Inactive Publication Date: 2010-11-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional molybdenum material and the subsequent development of TZM, AKS-Mo, La 2 o 3 Alloys such as -Mo have poor high-temperature strength, poor toughness and processability, which limit their application; and Mo-Re alloys have good comprehensive properties, but because Re is a scarce metal, its reserves are limited, and its price Also very high, not conducive to large-scale industrial production

Method used

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  • Die material for copper hot extrusion and preparation process thereof
  • Die material for copper hot extrusion and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A mold material for copper hot extrusion, mainly composed of Mo and La 2 o 3 / Mo 5 Si 3 Composite nanoparticles composed of La 2 o 3 / MoSi 2 The form of composite nanoparticles is added to molybdenum, and the addition amount is 1wt.%, La 2 o 3 with MoSi 2 The weight ratio is 1, and the purity and particle size of each raw material powder are as shown in Table 1.

[0025] Its preparation process steps are:

[0026] (1), ingredients

[0027] Prepare various powder raw materials according to the range of chemical composition, the purity of each raw material is greater than 99.9%, and the particle size is less than 5 μm;

[0028] (2), mixing

[0029] Put the prepared various raw material powders into the three-dimensional mixer and mix them until they are evenly mixed;

[0030] (3), compression molding

[0031] Put the well-mixed mixture into the elastic plastic sleeve, and press it by cold isostatic pressing, the cold isostatic pressure is 200MPa, and the time...

Embodiment 2

[0042] A mold material for copper hot extrusion, mainly composed of Mo and La 2 o 3 / Mo 5 Si 3 Composite nanoparticles composed of La 2 o 3 / MoSi 2 The form of composite nanoparticles is added to molybdenum, and the addition amount is 0.8wt.%, La 2 o 3 with MoSi 2 The weight ratio is 1:1, the purity of various raw materials is greater than 99.9%, and the particle size is less than 5 μm.

[0043] Its preparation process steps are:

[0044] (1), ingredients

[0045] Prepare various powder raw materials according to the range of chemical composition, the purity of each raw material is greater than 99.9%, and the particle size is less than 5 μm;

[0046] (2), mixing

[0047] Put the prepared various raw material powders into the three-dimensional mixer and mix them until they are evenly mixed;

[0048] (3), compression molding

[0049] Put the uniformly mixed mixture into the elastic plastic sleeve, and press it by cold isostatic pressing, the cold isostatic pressure ...

Embodiment 3

[0056] A mold material for copper hot extrusion, mainly composed of Mo and La 2 o 3 / Mo 5 Si 3 Composite nanoparticles composed of La 2 o 3 / MoSi 2 The form of composite nanoparticles is added to molybdenum, and the addition amount is 1.2wt.%, La 2 o 3 with MoSi 2 The weight ratio is 1:1.1, the purity of various raw materials is greater than 99.9%, and the particle size is less than 5 μm.

[0057] Its preparation process steps are:

[0058] (1), ingredients

[0059] Prepare various powder raw materials according to the range of chemical composition, the purity of each raw material is greater than 99.9%, and the particle size is less than 5 μm;

[0060] (2), mixing

[0061] Put the prepared various raw material powders into the three-dimensional mixer and mix them until they are evenly mixed;

[0062] (3), compression molding

[0063] Put the uniformly mixed mixture into the elastic plastic sleeve, and press it by cold isostatic pressing, the cold isostatic pressur...

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Abstract

The invention discloses a die material for copper hot extrusion and a preparation process thereof. The material consists of the following components in percentage by weight: 98.8 to 99.2 percent of micron-sized fine grain Mo matrix phase and 0.8 to 1.2 percent of La2O3/Mo5Si3 disperse phase, wherein the disperse phase is generated in situ by adding La2O3 and MoSi2 in a weight ratio of 1:1-1: 1.1 in the form of compound particles. The preparation process comprises the following steps of: mixing, compression molding of mixture, sintering, and forging. The molybdenum material has the characteristics of high strength, high toughness, low inflation ratio and the like because of synthetic actions of strengthening and toughening of the La2O3 and Mo5Si3 prepared in situ. The die material further optimizes the organizational structure and improves density and performance through subsequent forging process. Serving as the copper extrusion die material, the die material prolongs the service life to be more than 1,000 times/die so as to greatly improve production efficiency and reduce die cost.

Description

technical field [0001] The invention relates to a mold material for copper hot extrusion, and also relates to a preparation process of the mold material for copper hot extrusion. Background technique [0002] Extrusion die is a key part of extrusion equipment, which directly determines product quality, production efficiency and production cost. Extrusion dies operate under high temperature and high pressure and are subjected to cyclic loads, so the performance requirements for die materials are very high, such as high strength, high toughness, low thermal expansion rate, good thermal stability and thermal fatigue, high resistance Abrasiveness and excellent processing performance. The pros and cons of extrusion dies depend on the choice of die material. The choice of mold material has a very important impact on mold life and product quality. For copper and copper alloys, since the thermal processing temperature is as high as 800-1100°C, there are stricter requirements for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04B21C25/02B22F3/12
Inventor 王德志段柏华徐兵张理罡吴壮志昝秀颀孙翱魁汪异
Owner CENT SOUTH UNIV
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