Sintering method of calcium fluoride

Abstract

The embodiment of the invention discloses a sintering method of calcium fluoride. The method comprises the following steps: 1, fully mixing calcium fluoride powder and a deoxidant, and filling each graphite crucible with the mixture, vacuumizing the system to enable the vacuum degree in the vacuum furnace to reach 10<-3> Pa or above, and then raising the temperature to 300 DEG C at the speed of 50DEG C / h; keeping the temperature constant for two hours; then raising the temperature to be not lower than the melting point of the calcium fluoride powder at the speed of 50 DEG C / h, and keeping thetemperature constant for 10 hours to enable the fluoride powder to be fully molten; after melting, decreasing each graphite crucible at the speed of 5 mm / hr, wherein the lowering distance is 20 mm orabove larger than the total height of the multiple graphite crucibles, then conducting natural cooling to the room temperature, thereby producing a sintered block material of calcium fluoride. Compared with the prior art, a high constant temperature interval is obtained through adjustment, volatilization of raw materials at high temperature is avoided while the single sintering yield is increased, sintered lumps are convenient to grind and smash, and the production efficiency is effectively improved.

Description

technical field [0001] The invention relates to the field of crystal growth, in particular to a calcium fluoride sintering method. Background technique [0002] In the prior art, the fluoride powder is sintered in a single-layer crucible and a single-temperature zone heater. In order to increase the output of a single sintering, the height of the heater is usually high, and the temperature difference between the top and bottom of the crucible is large, resulting in When the raw materials at the bottom of the crucible melt, the top raw materials volatilize too much and lose more. Simultaneously, the volume of the block material fired from the single crucible is too large, which causes inconvenience to the later grinding process. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a calcium fluoride sintering method, which reduces the volatilization of raw materials, makes the sintered block easy to grind and pulverize, a...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, fluoride powder is sintered in a single-layer crucible and a single-temperature zone heater. In order to increase the output of a single sintering, the height of the heater is usually high, and the temperature difference between the top and bottom of the crucible is large, resulting in When the raw material at the bottom of the crucible melts, the volatilization of the raw material at the top is too large, resulting in a large loss

At the same time, the volume of the block fired from a single crucible is too large, which causes inconvenience to the later grinding process

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