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Process for preparing molybdenum-lanthanum alloy

A molybdenum-lanthanum alloy and a preparation process technology are applied in the field of powder metallurgy of molybdenum alloys, which can solve the problems affecting the reduction of molybdenum powder, affecting the uniformity and performance of the processed alloy, and achieve the effects of uniform structure, excellent performance and simple and easy method.

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

AI Technical Summary

Problems solved by technology

Since this method is carried out simultaneously with the reduction of molybdenum powder, it will affect the reduction of molybdenum powder, and then affect the uniformity and performance of the subsequent processed alloy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve lanthanum nitrate in alcohol, add to 10 kg of molybdenum powder (lanthanum oxide accounts for 0.9% of the total weight of the alloy) and stir evenly. The above powders were mixed in a V-type mixer, the ratio of ball to material was 0.2:1, and the mixing time was 24 hours. Most of the alcohol in it was dried in an oven up to 110°C for 24 hours. Put the powder into a rubber sleeve with a diameter of 90mm, isostatic pressing, and the pressing pressure is 2.2t / cm 3 , the holding time is 2 minutes. Sintered in a hydrogen high temperature sintering furnace, the sintering temperature is 1950 ℃, and the holding time is 4 hours. The scanning electron microscope photo of the sintered billet is shown in Figure 1, and its density is 9.65g / cm 3 .

Embodiment 2

[0025] Dissolve lanthanum nitrate in alcohol, add it to 10 kg of molybdenum powder (lanthanum oxide accounts for 1% of the total weight of the alloy) and stir evenly. The above powders were mixed in a ball mill, the ratio of ball to material was 1:1, and the mixing time was 1 hour. Most of the alcohol in it was dried in an oven up to 110°C for 24 hours. Put the powder into a rubber sleeve with a diameter of 90mm, isostatic pressing, and the pressing pressure is 2.2t / cm 3 , the holding time is 2 minutes. Sintered in a hydrogen high temperature sintering furnace, the sintering temperature is 1950 ℃, and the holding time is 4 hours. The bar is forged into a slab by a conventional process, and the thickness of the slab is about 25mm. The sheets are rolled, annealed and correspondingly caustic washed by known techniques until the thickness of the sheets is about 2.4 mm. The plate has a high recrystallization temperature, and the metallographic photograph after annealing at 1900...

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Abstract

The invention discloses a preparing method of molybdenum lanthanum alloy, which comprises the following steps: dissolving lanthanum nitrate through alcohol; adding in the molybdenum powder; making the product through powder metallurgical method.

Description

technical field [0001] A method for preparing molybdenum lanthanum alloy relates to a powder metallurgy method of rare earth modified molybdenum alloy. Background technique [0002] Refractory metal molybdenum has a wide range of uses in high temperature structural parts, aerospace industry, electronics industry and glass manufacturing due to its excellent high temperature strength, good electrical conductivity and thermal expansion properties. Rare earth-modified molybdenum alloys have replaced other molybdenum materials in many fields because of greatly increasing the recrystallization temperature of molybdenum and improving its sag resistance. The traditional method for preparing molybdenum-lanthanum alloy is to add an aqueous solution of lanthanum nitrate before preparing molybdenum powder, and to prepare molybdenum-lanthanum oxide alloy by decomposing lanthanum nitrate by proper heat preservation during the process of preparing molybdenum powder. Since this method is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C45/10B22F9/04B22F3/16
Inventor 刘宁平谭拴斌郭让民王艳邓自南雷铁柱王建平
Owner WESTERN METAL MATERIAL
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