Method for manufacturing alumina single crystal blocky raw material

Abstract

The invention aims to provide a method for manufacturing an alumina single crystal blocky raw material, and in particular relates to a manufacturing method for preparation of the alumina single crystal blocky raw material without sintering. The method comprises the following steps of: performing isostatic cool pressing processing on alumina powder in a purpose-made mold to obtain a blocky raw material with high filling performance; directly putting the blocky raw material into a single crystal furnace crucible to be used as the initial raw material for the growth of an alumina single crystal,wherein the purity of the blocky raw material is 99.999 percent, and the compression-resisting parameter of the blocky raw material is 0.1 to 50MPa; and after the raw material is prepared into a block through isostatic cool pressing, putting into an alumina crystal growth furnace crucible. The alumina powder is prepared into a blocky material through the isostatic cool pressing, so that various negative influences generated by the oxidization of the alumina powder can be obviously eliminated. The improved effects are mainly reflected in that: the alumina powder can be stored for more than half a year after being prepared into the block through the isostatic cool pressing, so that the quality of a substrate material cannot be influenced by the generation of an oxidation film.

Description

technical field [0001] The invention belongs to the field of semiconductor material production, and relates to the initial raw material of alumina single crystal (also known as sapphire, white gemstone) finished product, in particular to a method for manufacturing alumina single crystal bulk raw material. Background technique [0002] At present, the substrate materials of semiconductor LED diodes (also known as LED chips) include silicon (Si), silicon carbide (SiC), aluminum oxide (Al 2 o 3 )) Three kinds. Alumina single crystal is a mainstream product in the market because of its good chemical stability, no absorption of visible light, moderate price, and relatively mature manufacturing technology. [0003] Theoretically, alumina powder can be directly used to manufacture alumina single crystals; however, during the growth of single crystals in a single crystal furnace, it is usually necessary to vacuumize and fill inert protective gas, and the flow of the gas will cause...

AI Technical Summary

Problems solved by technology

The process takes a long time to manufacture and consumes a lot of energy, so the cost is high

[0005] In addition, from the point of view of the method of making block materials, the dry press can also form block materials by using one-way or two-way pressure with the help of a special mold, but due to the movement of particles and the rearrangement of particles between particles during the pressing process The friction between the particles and the mold wall will hinder the transmission of pressure. The pressure on the green body is small when it is far away from the pressurized surface, and the density of the whole green body is not uniform. It is not suitable for direct production of alumina single crystal. Thousands of degrees of high temperature sintering to form a block material