Method for manufacturing molybdenum plate blank through sintering

Abstract

The invention discloses a method for manufacturing a molybdenum plate blank through sintering. The method includes the steps that firstly, raw materials are weighed, and the weighed raw materials are evenly mixed, and mixed molybdenum powder is obtained; secondly, the mixed molybdenum powder is pressed into a plate blank in a cold isostatic pressing manner; and thirdly, under the hydrogen atmosphere, the plate blank is heated and sintered, and the molybdenum plate blank is obtained after being naturally cooled. Heating and sintering include the specific steps that firstly, the plate blank is firstly heated to 900 DEG C and sintered for 1 hour to 2 hours at the temperature of 900 DEG C, then the plate blank is heated to 1,500 DEG C and sintered for 2 hours to 4 hours at the temperature of 1,500 DEG C, and then the plate blank is heated to 750 DEG C to 1,780 DEG C and sintered for 6 hours to 10 hours at the temperature of 750 DEG C to 1,780 DEG C. According to the method, molybdenum powder used in the method is common brands of molybdenum powder in the market, cost is controllable, and purchase is easy; the apparent density of the mixed molybdenum powder is increased, fluidity is improved, a rubber sleeve is filled with the molybdenum powder more easily in the powder filling process, and the plate profile of the pressed blank is improved; and the maximum sintering temperature is lowered, and the loss of equipment and the like and energy consumption are reduced.

Description

Technical field [0001] The invention belongs to the technical field of powder metallurgy, and specifically relates to a method for preparing molybdenum slabs by sintering. Background technique [0002] In the production of LED display screens and solar thin films, molybdenum materials are commonly used as magnetron sputtering targets. Therefore, the molybdenum material used as a target is required to have the characteristics of high purity and uniform microstructure, and the performance of the molybdenum target is affected by the processing process. The purity and uniformity of the molybdenum slab of the raw material are particularly important. . As an important raw material for the target, molybdenum slabs are generally prepared by powder metallurgy. The main steps are: powder pretreatment, cold isostatic pressing, and hydrogen sintering. The existing preparation methods of molybdenum slabs mainly have the following problems: when fine-grained molybdenum powder is used to prep...

AI Technical Summary

Problems solved by technology

The existing molybdenum slab preparation methods mainly have the following problems: when using fine particle molybdenum powder to prepare a large single-weight slab, the molybdenum powder is easy to agglomerate, resulting in poor fluidity and low bulk density. It is easy to create a "bridge" between the two slabs, which requires multiple taps and vibrations, and the vibration effect is uncontrollable. The powder loading of different slabs is inconsistent, resulting in poor slab shape and uneven thickness; it is prepared by a single coarse-grained molybdenum powder For large single-weight slabs, the sintering and densification process is slow, the required sintering temperature is high, and the sintering time is long; and the use of submicron molybdenum powder can reduce the sintering temperature and shorten the sintering time, but the submicron molybdenum powder The powder production process is complicated, the cost is high, and it is not easy to promote

However, according to the patent CN201010107245, compared with conventional molybdenum powder, the production process of submicron (particle size ≤ 1.0 μm) molybdenum powder is complicated, and special reduction equipment is required, and the production cost is high.