Device for sintering transparent ceramics by induction heating

Abstract

A device for sintering transparent ceramics by induction heating comprises a double-layer stainless steel furnace mantle with an intermediate course where cooling water can pass and a bracket supporting the furnace mantle, wherein the upper and lower walls of the furnace mantle are provided with gas ports used when atmosphere sintering, a tray is installed at the center of the bottom of the internal wall of the furnace mantle, a quartz barrel is disposed on the tray, a ceramic sample to be sintered is disposed in a heating element, and the heating element is embedded in a heat insulating material inside the quartz barrel; the quartz barrel is covered with a quartz glass cover with a round hole at the center; an induction coil is installed outside the quartz barrel; one end of a tungsten-rhenium thermoelectric couple is penetrated into the quartz barrel passing through the round hole of the quartz glass cover and is tightly close to the external wall of the heating element; a main gas path is formed by a first baffle valve, a molecular pump, a second baffle valve and a mechanical pump connected gradually at the pumping hole of the upper side of the furnace mantle via pipelines, and pipelines directly communicated with the main gas path between the furnace mantle and the first baffle valve through the third baffle vale by the mechanical pump through the pipelines are gas bypasses.

Description

technical field [0001] The invention relates to transparent ceramics, in particular to a device for sintering transparent ceramics by induction heating. Background technique [0002] In 1959, General Electric Coble RL prepared the first Al 2 o 3 Transparent ceramics break the traditional concept of "ceramic opacity", greatly promote the development and application of ceramic sintering theory, expand the application range of ceramic materials, and open up new ways for the development and application of new high-performance optical materials. Transparent ceramics not only have excellent light transmission, but also have high strength, high hardness, corrosion resistance, high temperature resistance and other properties, which are far superior to general optical materials. Moreover, it has advantages in terms of preparation cost, size (compared to single crystal), optical functional effect, mechanical properties and thermal properties (compared to glass), especially the desig...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the electrothermal conversion efficiency of tungsten wire heating is relatively low, and the power consumption is large, and the tungsten wire cage is easy to volatilize and become brittle during high-temperature sintering, and the heating element is greatly lost, resulting in relatively high equipment maintenance costs.

The above two shortcomings lead to high sintering costs in vacuum tungsten wire sintering furnaces, which greatly increase the investment in research and development and production of transparent ceramics

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