Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing continuous fiber reinforced ceramic-based composite material by utilizing flash burning technology
The invention relates to a method for preparing a continuous fiber reinforced ceramic-based composite material by using a flash sintering technology, which comprises the following steps: firstly, putting a continuous ceramic fiber preform into a mold, and then gradually pouring a small amount of nano ceramic powder into the continuous ceramic fiber preform in the mold for many times; through mechanical oscillation, fully filling pores in the preform with nano ceramic powder; carrying out compression molding on the obtained loose composite material by adopting a certain pressure to obtain a green body; putting the green body into a flash furnace, heating to a preset temperature, and applying an electric field with preset electric field intensity until a flash phenomenon occurs; and then converting the power supply from a constant-voltage state to a constant-current state, carrying out heat preservation for a period of time under a preset current density, and finally, carrying out cooling to obtain the continuous fiber reinforced ceramic-based composite material. Compared with the prior art, the continuous fiber reinforced ceramic-based composite material has the advantages that thesintering temperature is low, the preparation period is short, the obtained composite material is more compact, ceramic grains are finer, and the mechanical property is more excellent.
本发明涉及一种利用闪烧技术制备连续纤维增强陶瓷基复合材料的方法，包括首先将连续陶瓷纤维预制体置于模具中，随后将纳米陶瓷粉体少量多次逐步倒入模具中连续陶瓷纤维预制体上，并经过机械振荡使纳米陶瓷粉体充分填充预制体内部的孔隙；之后将所得松散复合材料采用一定压力进行压制成型，得到坯体；然后将坯体置于闪烧炉中，升温至预设温度，并施加预设电场强度的电场，直至出现闪烧现象；随后将电源由恒压状态转变为恒流状态，并在预设电流密度下保温一段时间，最后经降温冷却后即得到连续纤维增强陶瓷基复合材料。与现有技术相比，本发明具有烧结温度低、制备周期短、所得复合材料更加致密、陶瓷晶粒更细小、力学性能更加优异等优点。
Method for preparing continuous fiber reinforced ceramic-based composite material by utilizing flash burning technology
The invention relates to a method for preparing a continuous fiber reinforced ceramic-based composite material by using a flash sintering technology, which comprises the following steps: firstly, putting a continuous ceramic fiber preform into a mold, and then gradually pouring a small amount of nano ceramic powder into the continuous ceramic fiber preform in the mold for many times; through mechanical oscillation, fully filling pores in the preform with nano ceramic powder; carrying out compression molding on the obtained loose composite material by adopting a certain pressure to obtain a green body; putting the green body into a flash furnace, heating to a preset temperature, and applying an electric field with preset electric field intensity until a flash phenomenon occurs; and then converting the power supply from a constant-voltage state to a constant-current state, carrying out heat preservation for a period of time under a preset current density, and finally, carrying out cooling to obtain the continuous fiber reinforced ceramic-based composite material. Compared with the prior art, the continuous fiber reinforced ceramic-based composite material has the advantages that thesintering temperature is low, the preparation period is short, the obtained composite material is more compact, ceramic grains are finer, and the mechanical property is more excellent.
本发明涉及一种利用闪烧技术制备连续纤维增强陶瓷基复合材料的方法，包括首先将连续陶瓷纤维预制体置于模具中，随后将纳米陶瓷粉体少量多次逐步倒入模具中连续陶瓷纤维预制体上，并经过机械振荡使纳米陶瓷粉体充分填充预制体内部的孔隙；之后将所得松散复合材料采用一定压力进行压制成型，得到坯体；然后将坯体置于闪烧炉中，升温至预设温度，并施加预设电场强度的电场，直至出现闪烧现象；随后将电源由恒压状态转变为恒流状态，并在预设电流密度下保温一段时间，最后经降温冷却后即得到连续纤维增强陶瓷基复合材料。与现有技术相比，本发明具有烧结温度低、制备周期短、所得复合材料更加致密、陶瓷晶粒更细小、力学性能更加优异等优点。
Method for preparing continuous fiber reinforced ceramic-based composite material by utilizing flash burning technology
一种利用闪烧技术制备连续纤维增强陶瓷基复合材料的方法
JIANG JUAN (Autor:in) / NI NA (Autor:in) / ZHAO XIAOFENG (Autor:in) / DING QI (Autor:in) / XIAO WEIWEI (Autor:in) / SHI YINCHUN (Autor:in)
29.01.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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