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Silicon nitride wave-transparent ceramic material with low thermal conductivity and preparation method thereof
The invention relates to the technical field of silicon nitride functional ceramic materials, and provides a low-thermal-conductivity silicon nitride wave-transparent ceramic material and a preparation method thereof. The preparation method comprises the following steps: mixing raw materials including silicon nitride chopped fibers, an opacifying agent, aluminum oxide, yttrium oxide, phenolic resin and a solvent, and performing ball milling to obtain a wet mixture; sequentially drying, sieving and carrying out compression molding to obtain a blank, and finally carrying out gradient sintering to obtain the low-thermal-conductivity silicon nitride wave-transparent ceramic material. The silicon nitride chopped fibers and the opacifying agent are matched for use, so that the heat conductivity of the silicon nitride wave-transparent ceramic material is reduced, and the strength of the silicon nitride wave-transparent ceramic material is improved by adding the phenolic resin; the porous silicon nitride wave-transparent ceramic material is obtained by using a specific gradient sintering process, so that the heat conductivity is further reduced, the dielectric constant is also reduced, and the problem of strength reduction caused by a pore-forming agent is avoided.
本发明涉及于氮化硅功能陶瓷材料技术领域，提供了一种低热导率氮化硅透波陶瓷材料及其制备方法。本发明将原料氮化硅短切纤维、遮光剂、氧化铝、氧化钇、酚醛树脂和溶剂混合后进行球磨，得到湿混料；然后依次进行烘干、过筛和模压成型，得到坯料，最后进行梯度烧结，得到低热导率氮化硅透波陶瓷材料。本发明通过将氮化硅短切纤维和遮光剂进行配合使用，降低了氮化硅透波陶瓷材料的热导率，通过加入酚醛树脂提高其强度；通过使用特定的梯度烧结工艺，获得多孔的氮化硅透波陶瓷材料，从而进一步降低了热导率，同时还降低了介电常数，并避免了造孔剂造成的强度下降问题。
Silicon nitride wave-transparent ceramic material with low thermal conductivity and preparation method thereof
The invention relates to the technical field of silicon nitride functional ceramic materials, and provides a low-thermal-conductivity silicon nitride wave-transparent ceramic material and a preparation method thereof. The preparation method comprises the following steps: mixing raw materials including silicon nitride chopped fibers, an opacifying agent, aluminum oxide, yttrium oxide, phenolic resin and a solvent, and performing ball milling to obtain a wet mixture; sequentially drying, sieving and carrying out compression molding to obtain a blank, and finally carrying out gradient sintering to obtain the low-thermal-conductivity silicon nitride wave-transparent ceramic material. The silicon nitride chopped fibers and the opacifying agent are matched for use, so that the heat conductivity of the silicon nitride wave-transparent ceramic material is reduced, and the strength of the silicon nitride wave-transparent ceramic material is improved by adding the phenolic resin; the porous silicon nitride wave-transparent ceramic material is obtained by using a specific gradient sintering process, so that the heat conductivity is further reduced, the dielectric constant is also reduced, and the problem of strength reduction caused by a pore-forming agent is avoided.
本发明涉及于氮化硅功能陶瓷材料技术领域，提供了一种低热导率氮化硅透波陶瓷材料及其制备方法。本发明将原料氮化硅短切纤维、遮光剂、氧化铝、氧化钇、酚醛树脂和溶剂混合后进行球磨，得到湿混料；然后依次进行烘干、过筛和模压成型，得到坯料，最后进行梯度烧结，得到低热导率氮化硅透波陶瓷材料。本发明通过将氮化硅短切纤维和遮光剂进行配合使用，降低了氮化硅透波陶瓷材料的热导率，通过加入酚醛树脂提高其强度；通过使用特定的梯度烧结工艺，获得多孔的氮化硅透波陶瓷材料，从而进一步降低了热导率，同时还降低了介电常数，并避免了造孔剂造成的强度下降问题。
Silicon nitride wave-transparent ceramic material with low thermal conductivity and preparation method thereof
一种低热导率氮化硅透波陶瓷材料及其制备方法
ZENG XIAOFENG (author) / ZHU FULIN (author) / XIAO LIANG (author) / XIAO LI (author) / XU TAO (author)
2023-06-23
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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