Preparation method of molybdenum product with heavy single weight

Abstract

The invention relates to a preparation method of a molybdenum product with heavy single weight, in particular to a method for preparing a rare metal product by a powder metallurgy method. The method is characterized by comprising the following steps: taking molybdenum dioxide as a raw material; carrying out high-temperature hydrogen reduction on the molybdenum dioxide to obtain a raw material molybdenum powder; pulverizing and sieving the initial raw material molybdenum powder, and then processing the molybdenum powder with a high-energy collision air-flow mill; and finally pressing the obtained molybdenum powder with large apparent density, high flow velocity and low impurity content into a molybdenum blank, and then sintering the molybdenum blank to obtain the molybdenum product. In themethod, the initial molybdenum powder with large apparent density, good fluidity and low impurity content is obtained by high-temperature hydrogen reduction on the molybdenum dioxide, and the apparent density of the molybdenum powder is further improved by high-energy collision air-flow mill processing to finally obtain the molybdenum product with the heavy single weight after forming and sintering. The method of the invention has low requirement on the raw material, easy controlled production process, and simple, safe and reliable operation, thus being applicable to batch production; and themolybdenum product with the heavy single weight which is 50% more than that of the common molybdenum power can be prepared in a mould with the same size.

Description

A kind of preparation method of large unit weight molybdenum product technical field The invention discloses a method for preparing large unit weight molybdenum products, relating to a method for preparing rare metal products by powder metallurgy. Background technique Molybdenum products are generally prepared by powder metallurgy, including main process steps such as powder making, forming, and sintering. There are some contradictions in the preparation of large unit weight products by ordinary molybdenum powder. , Forming, sintering and other processes become very difficult, and even some ultra-large single-weight products, such as molybdenum plates over 200kg, cannot even be completed on existing equipment. 2) Ordinary molybdenum powder has poor fluidity, and it is not easy to fill the molybdenum powder into every corner of the mold when preparing large unit weight products. 3) When a large unit weight product is sintered, the diffusion distance is large, and it is di...

AI Technical Summary

Problems solved by technology

There are some contradictions in the preparation of large unit weight products by ordinary molybdenum powder. , forming and sintering processes become very difficult, and even some super-large single-weight products, such as molybdenum plates over 200kg, cannot even be completed on existing equipment

2) Ordinary molybdenum powder has poor fluidity, and it is not easy to fill the molybdenum powder into every corner of the mold when preparing large unit weight products

3) When a large unit weight product is sintered, the diffusion distance is large, and it is difficult to remove impurities

However, plasma equipment is relatively expensive, the output is not large, and strict atmosphere protection is required

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