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Method for preparing Si3N4-Si2N2O-based wave-transparent ceramic material through normal-pressure sintering
The invention discloses a method for preparing a Si3N4-Si2N2O-based wave-transparent ceramic material by normal-pressure sintering, which comprises the following steps of: firstly, sintering Si powder and SiO powder to prepare Si2N2O powder, dispersing and homogenizing the Si2N2O powder to form gel-state liquid, adding an initiator into the gel-state liquid, carrying out physical and chemical reaction in a corresponding die cavity to form a high-strength blank in situ, and sintering the high-strength blank at normal pressure to prepare the Si3N4-Si2N2O-based wave-transparent ceramic material. The preparation method comprises the following steps: preparing a green body from Si2N2O, pre-sintering the green body to decompose a small part of Si2N2O to obtain Si3N4, and finally sintering at high temperature and normal pressure in a nitrogen atmosphere to inhibit decomposition of Si2N2O and densify the Si2N2O. According to the invention, the preparation of high-purity silicon oxynitride powder is realized through a method of sintering powder first and then sintering, the Si3N4-Si2N2O-based wave-transparent ceramic is prepared through a two-step sintering process, the excellent wave-transparent performance of Si2N2O is retained, the good mechanical performance of Si3N4 is introduced, and finally the preparation of the high-temperature-resistant wave-transparent ceramic material is realized.
本发明公开了一种常压烧结制备Si3N4—Si2N2O基透波陶瓷材料的方法，首先，通过Si粉和SiO粉末烧结制备Si2N2O粉末，再对其进行分散均匀化，使其形成凝胶态液，然后在凝胶态液中加入引发剂，在相应模腔内发生物理化学反应原位形成高强度坯体，再对此坯体进行预烧结，使得Si2N2O小部分分解得到Si3N4，最后在氮气氛围下高温常压烧结，抑制Si2N2O的分解，使其致密化。本发明通过“先烧粉+再烧结”的方法实现高纯度的氮氧化硅粉末制备，并通过两步烧结工艺制备出Si3N4—Si2N2O基透波陶瓷，在保留Si2N2O优异的透波性能同时引入Si3N4良好的机械性能，最终实现耐高温透波陶瓷材料的制备。
Method for preparing Si3N4-Si2N2O-based wave-transparent ceramic material through normal-pressure sintering
The invention discloses a method for preparing a Si3N4-Si2N2O-based wave-transparent ceramic material by normal-pressure sintering, which comprises the following steps of: firstly, sintering Si powder and SiO powder to prepare Si2N2O powder, dispersing and homogenizing the Si2N2O powder to form gel-state liquid, adding an initiator into the gel-state liquid, carrying out physical and chemical reaction in a corresponding die cavity to form a high-strength blank in situ, and sintering the high-strength blank at normal pressure to prepare the Si3N4-Si2N2O-based wave-transparent ceramic material. The preparation method comprises the following steps: preparing a green body from Si2N2O, pre-sintering the green body to decompose a small part of Si2N2O to obtain Si3N4, and finally sintering at high temperature and normal pressure in a nitrogen atmosphere to inhibit decomposition of Si2N2O and densify the Si2N2O. According to the invention, the preparation of high-purity silicon oxynitride powder is realized through a method of sintering powder first and then sintering, the Si3N4-Si2N2O-based wave-transparent ceramic is prepared through a two-step sintering process, the excellent wave-transparent performance of Si2N2O is retained, the good mechanical performance of Si3N4 is introduced, and finally the preparation of the high-temperature-resistant wave-transparent ceramic material is realized.
本发明公开了一种常压烧结制备Si3N4—Si2N2O基透波陶瓷材料的方法，首先，通过Si粉和SiO粉末烧结制备Si2N2O粉末，再对其进行分散均匀化，使其形成凝胶态液，然后在凝胶态液中加入引发剂，在相应模腔内发生物理化学反应原位形成高强度坯体，再对此坯体进行预烧结，使得Si2N2O小部分分解得到Si3N4，最后在氮气氛围下高温常压烧结，抑制Si2N2O的分解，使其致密化。本发明通过“先烧粉+再烧结”的方法实现高纯度的氮氧化硅粉末制备，并通过两步烧结工艺制备出Si3N4—Si2N2O基透波陶瓷，在保留Si2N2O优异的透波性能同时引入Si3N4良好的机械性能，最终实现耐高温透波陶瓷材料的制备。
Method for preparing Si3N4-Si2N2O-based wave-transparent ceramic material through normal-pressure sintering
一种常压烧结制备Si3N4-Si2N2O基透波陶瓷材料的方法
YIN RUIMING (Autor:in) / LI LONGTAO (Autor:in) / LI PENGFEI (Autor:in) / CHEN HONGKUN (Autor:in) / FAN YIHAO (Autor:in) / WANG MEIJUAN (Autor:in) / HUANG BIN (Autor:in) / CHEN DEQING (Autor:in) / LI GUANG (Autor:in)
12.11.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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