Preparation method of high-density and high-temperature-resistant molybdenum crucible

Abstract

The invention discloses a preparation method of a high-density and high-temperature-resistant molybdenum crucible, which comprises the following steps: (1) selecting materials: selecting molybdenum powder with the following mass ratio Mo >= 99 .95%, O <= 0.015%, N <= 0.005%, Si <= 0.002% and C <= 0.005%; (2) molding; (3) pressing; and (4) sintering. Compared with the general molybdenum crucible, the invention has the following advantages of simple process, stable product quality, larger production appearance size, and high sintering temperature; the product density is more than 9.8g / cm3, and the use temperature is more than 2000 DEG C; and the molybdenum content is up to 99.90%.

Description

technical field [0001] The invention relates to a preparation method of a high-density and high-temperature resistant molybdenum crucible. Background technique [0002] Molybdenum crucibles are mainly used in metallurgical industry, rare earth industry, metal neodymium, single crystal silicon, artificial crystal and mechanical processing industries. The existing production methods of molybdenum crucible mainly include powder metallurgy hot pressing forming and molybdenum plate welding. The production of molybdenum crucible by powder metallurgy hot pressing forming method requires high-precision special molds, resulting in high production cost and long manufacturing cycle of molybdenum crucible. Moreover, the wall of the formed molybdenum crucible is relatively thick, the whole is bulky, difficult to move, and the consumption of raw materials is relatively large. Molybdenum crucibles are made by welding molybdenum plates. The bottom of the crucible is made by cold pressing t...

AI Technical Summary

Problems solved by technology

The existing molybdenum crucible production methods mainly include powder metallurgy hot pressing forming and molybdenum plate welding. The production of molybdenum crucible by powder metallurgy hot pressing forming method requires high-precision special molds, resulting in high production cost and long manufacturing cycle of molybdenum crucible. Moreover, the wall of the formed molybdenum crucible is relatively thick, the whole is bulky, difficult to move, and the amount of raw materials is relatively large.

Molybdenum crucibles are made by welding molybdenum plates. The bottom of the crucible is made by cold pressing technology. Since the molybdenum material is a hard and brittle material with poor ductility at room temperature, the size of the crucible bottom is small and cannot meet the requirements of large sizes. The surface quality is not good, and there are obvious creases, resulting in low overall quality of the molybdenum crucible; there are many process links and low efficiency