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Molybdenum and molybdenum alloy material sintering method and application thereof

A sintering method and molybdenum alloy technology, applied in the field of powder metallurgy, can solve the problems of lack, consumption of free atoms, merger and growth, etc., to achieve the effect of improving work efficiency, reducing heating rate, and avoiding uneven macrostructure

Pending Publication Date: 2022-08-05
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat preservation process in the intermediate sintering stage consumes a large number of free atoms, forming multiple isolated local sintered structures. After reaching the highest sintering temperature, due to the lack of sufficient free atoms, only the merging and growth of adjacent grains can occur.

Method used

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  • Molybdenum and molybdenum alloy material sintering method and application thereof
  • Molybdenum and molybdenum alloy material sintering method and application thereof
  • Molybdenum and molybdenum alloy material sintering method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Example 1. Preparation of single weight 7kg board by passivating Mo-0.6La alloy powder

[0080] The present embodiment provides a molybdenum and molybdenum alloy material sintering method, comprising the following steps:

[0081] Step 1: Take 7.7kg Mo-0.6La alloy powder and The forged molybdenum balls are put into the 17L ball milling tank of the GH-17L three-dimensional motion high-efficiency mixer; set the ball milling procedure of "total ball milling time is 10h, after each ball milling time is 2.5h, the equipment is suspended for 1h"; The speed of the ball mill is greater than or equal to 30rpm;

[0082] After the ball milling, the molybdenum powder and the molybdenum balls are separated by a -10 mesh sieve, then the molybdenum powder is passed through a -100 mesh sieve to remove the molybdenum ball debris, and finally, the molybdenum powder is sieved with a -200 mesh, and the material under the sieve is taken as the passivated molybdenum powder;

[0083] Step 2:...

Embodiment 2

[0096] Example 2: Preparation of Passivated Pure Molybdenum Powder Molybdenum billet

[0097] With embodiment 1, the difference is, in this embodiment, weigh 18kg pure molybdenum powder and The forged molybdenum balls are put into the 50L ball milling tank of the GH-50L three-dimensional motion high-efficiency mixer; the ball mill is divided into 4 stages for 8 hours; the molybdenum powder and the molybdenum ball are separated by a -10 mesh sieve, and then the molybdenum powder is passed through - Molybdenum balls were removed by a 100-mesh sieve, and finally sieved with -200-mesh, and the material under the sieve was taken as passivated molybdenum powder; A compact with a single weight of 17kg;

[0098] In the ZTL-250 intermediate frequency sintering furnace, heat up and keep warm according to the following process:

[0099]

[0100] get After sintering the billet, it is forged at 1280°C to And 950 ℃ × 0.5h stress relief annealing.

[0101] The particle morpholo...

Embodiment 3

[0102] Example 3: Hydrogen reduction of Mo-0.6La alloy powder to prepare a slab with a single weight of 6.4kg

[0103] The same as Example 1, the difference is that the raw material Mo-0.6La alloy powder in this example is not passivated, and hydrogen is directly passed into it for heating and sintering.

[0104] Specifically include: using a movable steel mold with a rubber sleeve seal, the size of the precisely formed green compact is 40×158×158mm, and the density is 6.35g / cm 3 , sintering process:

[0105]

[0106] The size of the sintered blank is 33×138×138mm and the density is 9.7g / cm 3 . In the process of rolling the size of the basic bidirectional equal deformation to 3 × 450 × 450 mm, the edge is complete ( Figure 12 ), as-rolled metallographic Figure 13 shown, showing an isotropic rolling structure. The room temperature tensile strength, yield strength and elongation after fracture of the 950℃×0.5h annealed state of the two samples are 741MPa, 678MPa, 12%, ...

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Abstract

The invention discloses a molybdenum and molybdenum alloy material sintering method and application thereof.The molybdenum and molybdenum alloy material sintering method comprises the steps that after molybdenum and molybdenum alloy powder is pressed into a blank and put into a sintering furnace, hydrogen is introduced for heating sintering, the molybdenum and molybdenum alloy powder is subjected to passivating treatment before sintering, and the passivating treatment comprises the step that the molybdenum and molybdenum alloy powder is put into a ball mill for ball milling; the heating sintering comprises the following steps: heating for 2-3 hours, 2.5-3.5 hours and 6 hours, sequentially heating to 800 DEG C, 1100 DEG C and 1500 DEG C from room temperature, then heating to 1740 DEG C after 6-8 hours, and keeping the temperature for 6 hours; the passivating treatment comprises the steps that molybdenum grinding balls with the diameter of 5-20 mm and molybdenum and molybdenum alloy powder are put into a ball mill with the rotating speed larger than or equal to 30 rpm according to the ball-to-material ratio of (1-1.5): 1 to be subjected to ball milling, and the total ball milling time is 8-15 h. According to the sintering method, the highest sintering temperature is reduced, the total sintering time is shortened, the overall working efficiency is improved, and meanwhile it is guaranteed that a sintered product or billet has a microscopic structure with the average grain size being 15-20 microns.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a molybdenum and molybdenum alloy material sintering method and application thereof. Background technique [0002] Sintering is a physical and chemical process in which the powder or powder compact is heated to a temperature lower than the melting point of the main components, and then cooled to room temperature, and the powder particle aggregates become grain aggregates. Sintering is the last step in the powder metallurgy process. The material forms a certain microstructure, which gives it certain properties and plays a decisive role in the performance of the final product. [0003] Molybdenum and molybdenum alloy materials are sintered by powder compacts in hydrogen atmosphere. The whole process can be divided into 6 stages: physical impurity removal stage, chemical impurity removal stage, sintering neck formation stage, sintering neck growth stage, densif...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F3/10B22F9/04
CPCB22F9/04B22F3/02B22F3/1007B22F2009/043
Inventor 冯鹏发段琳琳党晓明邢军
Owner JINDUICHENG MOLYBDENUM CO LTD
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