Medium-frequency induction sintering method for neodymium-doped yttrium aluminum garnet laser ceramic

Abstract

The invention relates to a medium-frequency induction sintering method for neodymium-doped yttrium aluminum garnet laser ceramic and belongs to the technical field of laser ceramic preparation. In the prior art, a temperature field formed in a furnace chamber is not uniform, and the sintering is carried out according to a predetermined process curve without utilizing a real-time fine adjustment sintering process, so that the rate of finished products is decreased, the sintering process is complex, and the sintering time is long. According to the medium-frequency induction sintering method for the neodymium-doped yttrium aluminum garnet laser ceramic, a laser ceramic blank is sintered into a laser ceramic finished product at a high temperature. The medium-frequency induction sintering method is characterized by comprising the following steps: putting the laser ceramic blank into a metal crucible into a furnace chamber of a medium-frequency induction furnace; vacuumizing the furnace chamber; carrying out medium-frequency induction heating to increase the temperature to be 1350 DEG C at a temperature increase rate of 5DEG C / min-10DEG C / min, carrying out constant-temperature processing for 1-5 hours, then heating to 1750 DEG C at the temperature increase rate of 5DEG C / min-10DEG C / min, constant-temperature processing for 8-16 hours, then stopping heating, and naturally cooling to the room temperature, so as to obtain the finished neodymium-doped yttrium aluminum garnet laser ceramic.

Description

technical field [0001] The invention relates to an intermediate frequency induction sintering method of Nd-doped yttrium aluminum garnet laser ceramics, which belongs to the technical field of laser ceramic preparation. Background technique [0002] Nd-doped yttrium aluminum garnet laser ceramics, as the working material of the laser, have high doping atomic coefficient, excellent optical properties, high thermal conductivity, high damage threshold, high laser output efficiency, good thermal shock resistance, easy manufacturing, and low cost , large size, mass production, and easy access to multilayer and multifunctional ceramic structures play an important role in the field of high-power solid-state lasers. [0003] In the prior art, a vacuum sintering furnace is used to sinter Nd-doped yttrium aluminum garnet laser ceramics. The sintering process is roughly as follows. The laser ceramic body is placed in the cavity of the vacuum sintering furnace, and the cavity is evacua...

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Problems solved by technology

[0004] The technical problems of the method are as follows: the vacuum sintering furnace is heated by resistance, the temperature field formed in the furnace cavity is not uniform, and the ceramic structure of the obtained finished product is inconsistent, which not only has a large stress, but also brings damage to the laser ceramics. adverse effects on the optical properties of the vacuum sintering furnace; since there is no observation window in the vacuum sintering furnace, the sintering is carried out according to the established process curve, which belongs to blind sintering, and possible abnormalities cannot be found during the sintering process, and then the sintering process is fine-tuned in real time accordingly, and the yield rate will be reduced. ; The sintering process includes three sintering stages, three times of alternating temperature rise and constant temperature, resulting in complex sintering process and long sintering time. From the perspective of preparation, it is difficult, low in efficiency and high in energy consumption.