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Preparation method of porous boron nitride ceramic
The invention belongs to the field of non-metallic materials, and particularly relates to a preparation method of porous boron nitride ceramic, which comprises the following steps: a) placing expanded graphite in a mold for pressing and shaping to obtain a porous preform; and b) carrying out chemical vapor deposition on the porous preform by using boron trihalide and ammonia gas as gas sources to obtain the porous boron nitride ceramic. According to the preparation method provided by the invention, firstly, expanded graphite is pressed into a porous prefabricated body in a mold, then boron nitride is deposited on the surface of the porous prefabricated body in a chemical vapor deposition mode, the deposition thickness of the boron nitride is adjusted by controlling the deposition time, and the porous boron nitride ceramic with the controllable wall thickness is obtained. The expanded graphite has a self-bonding characteristic, so that a binder does not need to be added in the preparation process of the porous preform, and the porous preform is environment-friendly and pollution-free; and the porous preform pressed by the expanded graphite has the characteristic of good dimensional stability, so that the porous preform is free of small molecule release and dimensional change in the chemical deposition process, and near-net size forming of the material can be realized.
本发明属于非金属材料领域，尤其涉及一种多孔氮化硼陶瓷的制备方法，包括以下步骤：a)将膨胀石墨置于模具中压制定型，得到多孔预制体；b)采用三卤化硼和氨气为气源，对多孔预制体进行化学气相沉积，得到多孔氮化硼陶瓷。本发明提供的制备方法首先将膨胀石墨在模具内压制成多孔预制体，然后采用化学气相沉积的方式在多孔预制体表面沉积氮化硼，通过控制沉积时间调整氮化硼的沉积厚度，得到壁厚可控的多孔氮化硼陶瓷。由于膨胀石墨具有自粘结特性，因此多孔预制体制备过程中无需添加粘结剂，环保无污染；并且由于膨胀石墨压制出的多孔预制体具有尺寸稳定性好的特点，其在化学沉积过程无小分子释放，不发生尺寸变化，可实现材料的近净尺寸成型。
Preparation method of porous boron nitride ceramic
The invention belongs to the field of non-metallic materials, and particularly relates to a preparation method of porous boron nitride ceramic, which comprises the following steps: a) placing expanded graphite in a mold for pressing and shaping to obtain a porous preform; and b) carrying out chemical vapor deposition on the porous preform by using boron trihalide and ammonia gas as gas sources to obtain the porous boron nitride ceramic. According to the preparation method provided by the invention, firstly, expanded graphite is pressed into a porous prefabricated body in a mold, then boron nitride is deposited on the surface of the porous prefabricated body in a chemical vapor deposition mode, the deposition thickness of the boron nitride is adjusted by controlling the deposition time, and the porous boron nitride ceramic with the controllable wall thickness is obtained. The expanded graphite has a self-bonding characteristic, so that a binder does not need to be added in the preparation process of the porous preform, and the porous preform is environment-friendly and pollution-free; and the porous preform pressed by the expanded graphite has the characteristic of good dimensional stability, so that the porous preform is free of small molecule release and dimensional change in the chemical deposition process, and near-net size forming of the material can be realized.
本发明属于非金属材料领域，尤其涉及一种多孔氮化硼陶瓷的制备方法，包括以下步骤：a)将膨胀石墨置于模具中压制定型，得到多孔预制体；b)采用三卤化硼和氨气为气源，对多孔预制体进行化学气相沉积，得到多孔氮化硼陶瓷。本发明提供的制备方法首先将膨胀石墨在模具内压制成多孔预制体，然后采用化学气相沉积的方式在多孔预制体表面沉积氮化硼，通过控制沉积时间调整氮化硼的沉积厚度，得到壁厚可控的多孔氮化硼陶瓷。由于膨胀石墨具有自粘结特性，因此多孔预制体制备过程中无需添加粘结剂，环保无污染；并且由于膨胀石墨压制出的多孔预制体具有尺寸稳定性好的特点，其在化学沉积过程无小分子释放，不发生尺寸变化，可实现材料的近净尺寸成型。
Preparation method of porous boron nitride ceramic
一种多孔氮化硼陶瓷的制备方法
YANG JINHUA (author) / JIAO JIAN (author) / LIU HU (author) / AI YINGJUN (author) / ZHOU YIRAN (author) / SONG JIUPENG (author)
2024-09-03
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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