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Process for preparing molybdenum alloy TZM by powder metallurgy

A technology of powder metallurgy and molybdenum alloy, which is applied in the direction of metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of reduced uniformity of material structure, influence of high temperature performance of materials, uneven sintering and diffusion, etc., to improve high temperature performance and room temperature brittleness, small particle size, and excellent performance

Inactive Publication Date: 2007-05-16
WESTERN METAL MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the Fischer particle size of titanium hydride and zirconium hydride powders selected for conventional powder metallurgy TZM molybdenum alloys is greater than 20 μm, and the problems caused by this are mainly manifested in: (1) Due to the relatively large particle size of the second phase, subsequent sintering It is difficult to make its diffusion uniform during the process; (2) The uniformity of the material structure is reduced due to the uneven sintering diffusion, which not only affects the high temperature performance of the material, but also makes the material show brittleness at room temperature

Method used

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  • Process for preparing molybdenum alloy TZM by powder metallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 10 kg of molybdenum powder, 50 grams of titanium hydride, 10 grams of zirconium hydride, and 6 grams of carbon black. Mix in a V-type mixer, the ball-to-material ratio is 0.2:1, and the mixing time is 24 hours. Choose a rubber sleeve with a diameter of 90mm, charge it, and press it isostatically with a pressure of 2.2t / cm 2 , holding time 2 minutes. Carry out sintering in a vacuum induction furnace, the sintering temperature is 1900°C, and the holding time is 4 hours. The density of the material after sintering is 9.5g / cm 3 , as shown in Figure 1. The carbon content of the sintered material is 0.01%, the oxygen content is 0.02%, the titanium content is 0.45%, and the zirconium content is 0.06%.

Embodiment 2

[0020] 10 kg of molybdenum powder, 50 grams of titanium hydride, 10 grams of zirconium hydride, and 6 grams of carbon black. Mix in a ball mill, the ratio of ball to material is 1:1, and the mixing time is 4 hours. Choose a rubber sleeve with a diameter of 90mm, charge it, and press it isostatically with a pressure of 2.2t / cm 2 , holding time 2 minutes. Carry out sintering in a vacuum induction furnace, the sintering temperature is 1900°C, and the holding time is 4 hours. The chemical composition of the sintered material conforms to the standard ASTM387-90, and the density is 9.5g / cm 3 . The bar is forged into a slab with a conventional process, and the thickness of the slab is about 25 mm. Rolling, annealing and corresponding alkali washing are adopted to treat the plate until the thickness of the plate is about 2.4mm. The test results show that the recrystallization temperature of the material is greater than 1550°C, and the scanning electron microscope photo after anne...

Embodiment 3

[0024] 80 kilograms of molybdenum powder, 400 grams of titanium hydride, 80 grams of zirconium hydride, and 48 grams of carbon black. Mix in a ball mill, the ratio of ball to material is 1:1, and the mixing time is 1 hour. Choose a rubber sleeve with a diameter of 220mm, charge it, and press it isostatically with a pressure of 2.2t / cm 2 , holding time 2 minutes. Sintering is carried out in a vacuum induction furnace, the sintering temperature is 1900°C, and the holding time is 6 hours. The chemical composition of the sintered material conforms to the standard ASTM387-90, and the density is 9.5g / cm 3 . The rods were forged to a diameter of 80 mm using conventional techniques. After annealing at 1150°C for 1 hour, the yield strength is 785MPa, the tensile strength is 852MPa, and the elongation is 28%. The corresponding metallographic photos are shown in Figure 3.

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Abstract

The invention discloses a preparing method of difficult dissolving alloy through powder metallurgical technique, which is characterized by the following: selecting titanium hydride and zirconium hydride particle of Fisher grain at 5-10um with maximum particle not more than 10um; preparing TZM modybdenum alloy; dispersing evenly in the sintering course due to little second phase grain size; improving high-temperature property and normal-temperature fragility.

Description

technical field [0001] A method for preparing molybdenum alloy TZM by powder metallurgy relates to a method for preparing a refractory metal alloy by powder metallurgy. Background technique [0002] TZM molybdenum alloy is a commonly used molybdenum alloy. Due to its excellent high temperature strength, good electrical conductivity and thermal expansion properties, it is widely used in high temperature structural parts, aerospace industry, electronics industry and glass manufacturing industry. The powder metallurgy method is a relatively cheap method for preparing TZM molybdenum alloy, so it has been widely used. Generally, the Fischer particle size of titanium hydride and zirconium hydride powders selected for conventional powder metallurgy TZM molybdenum alloys is greater than 20 μm, and the problems caused by this are mainly manifested in: (1) Due to the relatively large particle size of the second phase, subsequent sintering (2) The uniformity of the material structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C45/10B22F9/04B22F3/16C22F1/18B21B37/00B21J1/06
Inventor 奚正平谭拴斌郭让民梁静刘宁平邓自南马煜波
Owner WESTERN METAL MATERIAL
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