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A preparation method of small-sized high-precision molybdenum alloy parts

A molybdenum alloy, high-precision technology, applied in the field of powder metallurgy, can solve the problems of delayed molybdenum alloy sintering and densification process, uneven distribution of granulated powder elements, unfavorable product comprehensive performance, etc., to achieve uniform and stable slurry supply, high quality Effect of dimensional accuracy and high dimensional accuracy

Active Publication Date: 2018-05-15
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder prepared by this technology is nearly spherical and has a suitable particle size range, which can effectively improve the fluidity and loose ratio, and is easy to fill and form. Uneven distribution of elements, and then uneven distribution of elements in the granulated powder, resulting in uneven distribution of elements in the final product and affecting the final quality of the product
[0010] At the same time, due to the addition of alloy elements, the sintering and densification process of molybdenum alloys is significantly delayed, and the sintering temperature is greatly increased, which is different from conventional molybdenum metal sintering. This not only puts forward higher requirements for sintering equipment, but also makes the grains easy to grow. Not conducive to the overall performance of the product

Method used

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  • A preparation method of small-sized high-precision molybdenum alloy parts
  • A preparation method of small-sized high-precision molybdenum alloy parts

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preparation example Construction

[0045] The equipment used in the preparation process of the small-sized high-precision molybdenum alloy parts of the present invention includes a circulating slurry tank. like figure 1 and figure 2 A circulating slurry tank shown includes a tank body 12 and a tank cover 4 with a movable cover arranged on the tank body 12, the bottom of the tank body 12 is provided with a discharge port 11, and the discharge port 11 is provided with There is a valve 10, the inside of the tank body 12 is provided with a stirring shaft 8, the lower part of the stirring shaft 8 is provided with a blade, and the upper part of the stirring shaft 8 passes through the tank cover 4 and is connected with a drive mechanism located outside the tank body 12, Described tank body 12 is provided with feeding pipe, as figure 1 As shown, the feed pipe includes a steel pipe 13-1 and a rubber hose 13-2 connected to the steel pipe 13-1, the steel pipe 13-1 is a stainless steel pipe, the steel pipe 13-1 is locat...

Embodiment 1

[0056] The preparation method of the small-sized high-precision molybdenum alloy part of this embodiment comprises the following steps:

[0057] Step 1, using 20g La with a mass purity of more than 99.95% 2 o 3 powder and 10g CeO 2 The powder is additive powder. Put 970g of molybdenum powder and additive powder together into a ball mill jar, then add 4000g of molybdenum balls and 15mL of absolute ethanol, and then install it on a ball mill for ball milling under argon atmosphere. The speed of ball milling is 280r / min, the time of ball milling is 60h, so that molybdenum powder, La 2 o 3 , CeO 2 Repeat the process of powder deformation, cold welding, crushing, etc. to obtain a molybdenum alloy composite powder that is cold welded between elements and evenly distributed. Dissolve 50g of PVA in 1000mL of deionized water, add 15g of PAA to mix and prepare a solution, and add the solution to the circulating slurry material tank, then add molybdenum alloy composite powder into ...

Embodiment 2

[0065] The preparation method of the small-sized high-precision molybdenum alloy part of this embodiment comprises the following steps:

[0066] Step 1, using 15g La with a mass purity of more than 99.95% 2 o 3 powder and 0.3g CeO 2 The powder is additive powder, put 984.7g molybdenum powder and additive powder together into a ball mill jar, then add 5987g ​​molybdenum balls and 15mL absolute ethanol, then install it on a ball mill, and ball mill under vacuum condition, the speed of ball milling is 400r / min , the ball milling time is 24h, so that molybdenum powder, La 2 o 3 , CeO 2 Repeat the process of powder deformation, cold welding, crushing and so on to obtain molybdenum alloy composite powder which is cold welded and evenly distributed between elements. Dissolve 10g PVA in 700mL deionized water, add 10g PAA to mix and prepare a solution, and add the solution to the circulating slurry material tank, then add molybdenum alloy composite powder into the solution and sti...

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Abstract

The invention provides a method for preparing small-sized high-precision molybdenum alloy parts, which includes the following steps: 1. Ball milling molybdenum powder and additive powder to obtain molybdenum alloy composite powder, and then adding molybdenum alloy composite powder and solution to the circulating slurry Suspension slurry is made in the material tank, and then spray granulation treatment is carried out to obtain spherical granulated powder, which is sieved; 2. Continuous molding to obtain compact; 3. Pre-sintering; 4. Sintering; 5. Thermal Isostatic pressing sintering; 6. Intensive trimming to obtain small-sized high-precision molybdenum alloy parts. The components of the molybdenum alloy parts prepared by the invention are evenly distributed, have high dimensional accuracy, and can avoid or reduce machining.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and relates to a method for preparing molybdenum alloy parts, in particular to a method for preparing small-sized and high-precision molybdenum alloy parts. Background technique [0002] With the development of IT-related industries, the demand for component products of devices used in the optical and electronic power industries has increased dramatically, and this increase has stimulated the rapid development of fine parts and parts with fine feature structures. [0003] Products produced by the traditional powder pressing and sintering process have low dimensional accuracy and limited shape, especially small-sized, high-precision, thin-walled products with internal steps or arc structures, and the processing performance of molybdenum at room temperature is poor. When preparing parts such as molybdenum and molybdenum alloys by processing methods, not only the processing cost is high, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/05B22F9/04B22F9/02B22F1/00
CPCC22C1/05C22C27/04C22C32/0031B22F9/026B22F9/04B22F2009/043B22F2999/00B22F2998/10B22F1/10B22F3/1007B22F2201/013B22F2201/20B22F3/15B22F3/02
Inventor 张晓王娜席莎安耿付静波卜春阳王磊
Owner JINDUICHENG MOLYBDENUM CO LTD
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