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High-strength boron nitride ceramic composite material based on low-temperature hot pressing sintering
The invention discloses a high-strength boron nitride ceramic composite material based on low-temperature hot pressing sintering, and belongs to the technical field of ceramic preparation. The preparation method comprises the following steps: adding titanium carbide whiskers, silicon carbide whiskers and a small amount of a sintering aid B2O3 to high-purity hexagonal boron nitride (h-BN) powder used as a raw material, stirring in an ultrasonic environment, adding chromium and graphene, and stirring under an ultrasonic condition; putting the raw materials into a ball milling tank, adding zirconium oxide milling balls (a material-to-ball ratio of 1:10), carrying out ball milling for 20 hours by taking absolute ethyl alcohol as a ball milling medium, and drying in a drying box for 12 hours; and grinding the mixture, and screening to obtain uniform composite powder. According to the invention, the boron nitride ceramic composite material is prepared by adopting a hot pressing sintering method at a low sintering temperature (1300-1500 DEG C), wherein the compactness and the bending strength of the boron nitride ceramic composite material can be obviously improved by increasing the sintering temperature and increasing the sintering pressure within a low sintering temperature range while the increase amplitude of the fracture toughness is small.
一种基于低温热压烧结的高强度氮化硼陶瓷复合材料，属于陶瓷制备技术领域。本发明通过以下方法得到。以高纯六方氮化硼(h‑BN)粉体为原料，添加碳化钛晶须、碳化硅晶须和少量的烧结助剂BO，在超声波环境下搅拌，然后加入铬和石墨烯，在超声波条件下进行搅拌。将原料放入球磨罐中，以无水乙醇为球磨介质，加入氧化锆磨球(料球比为1:10)，球磨20 h后在干燥箱中干燥12 h，最后对混合料进行研磨和过筛即获得均匀的复合粉料。在较低的烧结温度下(1300~1500℃)采用热压烧结方法制备氮化硼陶瓷复合材料。在较低的烧结温度范围，提高烧结温度和增大烧结压力能够明显提高氮化硼陶瓷复合材料的致密度和抗弯强度，但断裂韧性增加幅度较小。
High-strength boron nitride ceramic composite material based on low-temperature hot pressing sintering
The invention discloses a high-strength boron nitride ceramic composite material based on low-temperature hot pressing sintering, and belongs to the technical field of ceramic preparation. The preparation method comprises the following steps: adding titanium carbide whiskers, silicon carbide whiskers and a small amount of a sintering aid B2O3 to high-purity hexagonal boron nitride (h-BN) powder used as a raw material, stirring in an ultrasonic environment, adding chromium and graphene, and stirring under an ultrasonic condition; putting the raw materials into a ball milling tank, adding zirconium oxide milling balls (a material-to-ball ratio of 1:10), carrying out ball milling for 20 hours by taking absolute ethyl alcohol as a ball milling medium, and drying in a drying box for 12 hours; and grinding the mixture, and screening to obtain uniform composite powder. According to the invention, the boron nitride ceramic composite material is prepared by adopting a hot pressing sintering method at a low sintering temperature (1300-1500 DEG C), wherein the compactness and the bending strength of the boron nitride ceramic composite material can be obviously improved by increasing the sintering temperature and increasing the sintering pressure within a low sintering temperature range while the increase amplitude of the fracture toughness is small.
一种基于低温热压烧结的高强度氮化硼陶瓷复合材料，属于陶瓷制备技术领域。本发明通过以下方法得到。以高纯六方氮化硼(h‑BN)粉体为原料，添加碳化钛晶须、碳化硅晶须和少量的烧结助剂BO，在超声波环境下搅拌，然后加入铬和石墨烯，在超声波条件下进行搅拌。将原料放入球磨罐中，以无水乙醇为球磨介质，加入氧化锆磨球(料球比为1:10)，球磨20 h后在干燥箱中干燥12 h，最后对混合料进行研磨和过筛即获得均匀的复合粉料。在较低的烧结温度下(1300~1500℃)采用热压烧结方法制备氮化硼陶瓷复合材料。在较低的烧结温度范围，提高烧结温度和增大烧结压力能够明显提高氮化硼陶瓷复合材料的致密度和抗弯强度，但断裂韧性增加幅度较小。
High-strength boron nitride ceramic composite material based on low-temperature hot pressing sintering
一种基于低温热压烧结的高强度氮化硼陶瓷复合材料
XU SHUBO (Autor:in) / SUN HUAXIN (Autor:in) / SUN HAIBO (Autor:in) / ZHANG SHICHAO (Autor:in) / WANG HANLIN (Autor:in) / LIU JIANYING (Autor:in) / SUN XING (Autor:in)
17.04.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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