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Hot pressed sintering method of optical zinc sulfide fairing
The hot pressing sintering method of the optical zinc sulfide fairing comprises the steps that zinc sulfide powder is pretreated; the pretreated zinc sulfide powder and a sintering additive with the melting point lower than that of zinc sulfide are mixed and put into a mold with the thermal expansion coefficient smaller than that of zinc sulfide polycrystals, the mold is put into a hot pressing furnace, the furnace is closed, the weight of the mixed powder put into the mold exceeds the raw material weight required by an ideal product of the mold, and the mold is coated with a release agent in advance; starting, when the absolute air pressure is reduced to 500 Pa or below, starting temperature rise, and meanwhile, continuously vacuumizing until the pressure is not greater than 5 Pa; in the first stage, the temperature is increased to 300-400 DEG C of the second stage at the speed of 5-10 DEG C/min, and heat preservation is conducted for S4, the vacuum pressure at the target temperature of 300-400 DEG C of the second section is not larger than 5 Pa; 10 min before the second section is finished, cold-state pre-pressing is conducted, and the pressure is 40%-60% of the process pressure; in the third stage, the temperature is continuously increased to 900-1000 DEG C at the speed of 5-10 DEG C/min, after the temperature is increased to 900-1000 DEG C, heat preservation is conducted for 30-60 min, the process pressure is increased to 20-40 MPa within 30 min, and finally heat preservation is conducted for 60-120 min; and after heat and pressure preservation is finished, releasing the pressure, stopping heating, naturally cooling, cooling to room temperature along with the furnace, and discharging from the furnace.
一种光学硫化锌整流罩的热压烧结方法包括步骤：硫化锌粉体预处理；装料：将预处理后的硫化锌粉体与熔点比硫化锌低的烧结添加剂混合装入热膨胀系数比硫化锌多晶小的模具，置于热压炉，合炉，装入模具的混合粉体的重量超过模具理想产品要求的原料重量，模具预先涂有脱模剂；启动，绝对气压降到500Pa以下时，启动升温，同时继续抽真空至不大于5Pa；第一段以5‑10℃/min升到第二段的300‑400℃并保温1‑4h；S4，第二段目标温度300‑400℃的真空压力不大于5Pa；第二段结束前10min，冷态预压，为工艺压力的40‑60％；在第三段，继续以5‑10℃/min升到工艺温度900‑1000℃，到温后，保温30‑60min，在30min提升到工艺压力20‑40MPa，最后再保持60‑120min；保温保压结束后，压力释放，关闭加热，自然降温，随炉冷至室温，出炉。
Hot pressed sintering method of optical zinc sulfide fairing
The hot pressing sintering method of the optical zinc sulfide fairing comprises the steps that zinc sulfide powder is pretreated; the pretreated zinc sulfide powder and a sintering additive with the melting point lower than that of zinc sulfide are mixed and put into a mold with the thermal expansion coefficient smaller than that of zinc sulfide polycrystals, the mold is put into a hot pressing furnace, the furnace is closed, the weight of the mixed powder put into the mold exceeds the raw material weight required by an ideal product of the mold, and the mold is coated with a release agent in advance; starting, when the absolute air pressure is reduced to 500 Pa or below, starting temperature rise, and meanwhile, continuously vacuumizing until the pressure is not greater than 5 Pa; in the first stage, the temperature is increased to 300-400 DEG C of the second stage at the speed of 5-10 DEG C/min, and heat preservation is conducted for S4, the vacuum pressure at the target temperature of 300-400 DEG C of the second section is not larger than 5 Pa; 10 min before the second section is finished, cold-state pre-pressing is conducted, and the pressure is 40%-60% of the process pressure; in the third stage, the temperature is continuously increased to 900-1000 DEG C at the speed of 5-10 DEG C/min, after the temperature is increased to 900-1000 DEG C, heat preservation is conducted for 30-60 min, the process pressure is increased to 20-40 MPa within 30 min, and finally heat preservation is conducted for 60-120 min; and after heat and pressure preservation is finished, releasing the pressure, stopping heating, naturally cooling, cooling to room temperature along with the furnace, and discharging from the furnace.
一种光学硫化锌整流罩的热压烧结方法包括步骤：硫化锌粉体预处理；装料：将预处理后的硫化锌粉体与熔点比硫化锌低的烧结添加剂混合装入热膨胀系数比硫化锌多晶小的模具，置于热压炉，合炉，装入模具的混合粉体的重量超过模具理想产品要求的原料重量，模具预先涂有脱模剂；启动，绝对气压降到500Pa以下时，启动升温，同时继续抽真空至不大于5Pa；第一段以5‑10℃/min升到第二段的300‑400℃并保温1‑4h；S4，第二段目标温度300‑400℃的真空压力不大于5Pa；第二段结束前10min，冷态预压，为工艺压力的40‑60％；在第三段，继续以5‑10℃/min升到工艺温度900‑1000℃，到温后，保温30‑60min，在30min提升到工艺压力20‑40MPa，最后再保持60‑120min；保温保压结束后，压力释放，关闭加热，自然降温，随炉冷至室温，出炉。
Hot pressed sintering method of optical zinc sulfide fairing
光学硫化锌整流罩的热压烧结方法
LIU YANG (author) / YU JINFENG (author) / FAN CHENGLONG (author) / YANG YANPEI (author) / CHEN YIMING (author) / YOU QINGSONG (author)
2024-07-05
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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