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Method for preparing high-thermal-conductivity silicon nitride ceramic through gel casting of water-based slurry
The invention discloses a method for preparing high-thermal-conductivity silicon nitride ceramic through gel casting of water-based slurry. According to the method, water is used as a medium for dispersing the slurry, and meanwhile, the high-thermal-conductivity silicon nitride ceramic is prepared by adopting a gel casting process. The method comprises the following steps: firstly, dispersing high-thermal-conductivity silicon nitride ceramic powder added with a magnesium compound and a rare earth element compound as sintering aids by adopting deionized water, and adding a stable, non-volatile and strong-alkalinity reagent to increase the pH value of slurry to a certain degree so as to relieve silicon nitride particle agglomeration caused by the magnesium compound in the slurry and to control the viscosity of the slurry in a certain range; and forming a ceramic biscuit through a gel casting process, drying the biscuit, discharging glue, performing cold isostatic pressing enhancement, and performing air pressure sintering in a graphite heating furnace in a carbon thermal reducing atmosphere to obtain a high-thermal-conductivity silicon nitride ceramic material. The high-thermal-conductivity silicon nitride ceramic material prepared by the method is excellent in performance, the thermal conductivity of the material can reach 60 W.m<-1>. K<-1> or above, and the bending strength of the material can reach 800 MPa or above.
本发明提出一种水基浆料凝胶注模成型制备高导热氮化硅陶瓷的方法，将水作为浆料分散的介质，同时采用凝胶注模成型工艺制备高导热氮化硅陶瓷，过程包括首先采用去离子水分散添加了镁化合物和稀土元素化合物作为烧结助剂的高导热氮化硅陶瓷粉料，通过添加稳定不易挥发且碱性较强的试剂来提高浆料pH值到一定程度，以缓解浆料中的镁化合物引起的氮化硅颗粒团聚，来控制浆料粘度在一定范围，通过凝胶注模成型工艺成型陶瓷素坯后，待坯体经干燥、排胶并冷等静压增强后在碳热还原性氛围的石墨加热炉中进行气压烧结，得到高导热氮化硅陶瓷材料。采用该方法制备的高导热氮化硅陶瓷材料性能优越，热导率可达60W·m‑1·K‑1以上，抗弯强度可达800MPa以上。
Method for preparing high-thermal-conductivity silicon nitride ceramic through gel casting of water-based slurry
The invention discloses a method for preparing high-thermal-conductivity silicon nitride ceramic through gel casting of water-based slurry. According to the method, water is used as a medium for dispersing the slurry, and meanwhile, the high-thermal-conductivity silicon nitride ceramic is prepared by adopting a gel casting process. The method comprises the following steps: firstly, dispersing high-thermal-conductivity silicon nitride ceramic powder added with a magnesium compound and a rare earth element compound as sintering aids by adopting deionized water, and adding a stable, non-volatile and strong-alkalinity reagent to increase the pH value of slurry to a certain degree so as to relieve silicon nitride particle agglomeration caused by the magnesium compound in the slurry and to control the viscosity of the slurry in a certain range; and forming a ceramic biscuit through a gel casting process, drying the biscuit, discharging glue, performing cold isostatic pressing enhancement, and performing air pressure sintering in a graphite heating furnace in a carbon thermal reducing atmosphere to obtain a high-thermal-conductivity silicon nitride ceramic material. The high-thermal-conductivity silicon nitride ceramic material prepared by the method is excellent in performance, the thermal conductivity of the material can reach 60 W.m<-1>. K<-1> or above, and the bending strength of the material can reach 800 MPa or above.
本发明提出一种水基浆料凝胶注模成型制备高导热氮化硅陶瓷的方法，将水作为浆料分散的介质，同时采用凝胶注模成型工艺制备高导热氮化硅陶瓷，过程包括首先采用去离子水分散添加了镁化合物和稀土元素化合物作为烧结助剂的高导热氮化硅陶瓷粉料，通过添加稳定不易挥发且碱性较强的试剂来提高浆料pH值到一定程度，以缓解浆料中的镁化合物引起的氮化硅颗粒团聚，来控制浆料粘度在一定范围，通过凝胶注模成型工艺成型陶瓷素坯后，待坯体经干燥、排胶并冷等静压增强后在碳热还原性氛围的石墨加热炉中进行气压烧结，得到高导热氮化硅陶瓷材料。采用该方法制备的高导热氮化硅陶瓷材料性能优越，热导率可达60W·m‑1·K‑1以上，抗弯强度可达800MPa以上。
Method for preparing high-thermal-conductivity silicon nitride ceramic through gel casting of water-based slurry
一种水基浆料凝胶注模成型制备高导热氮化硅陶瓷的方法
QI HAI (author) / ZHANG PEIZHI (author) / TIAN YUNLONG (author) / GUO FANGQUAN (author)
2022-02-15
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
/
B28B
Formgeben von Ton oder anderen keramischen Stoffzusammensetzungen, Schlacke oder von Mischungen, die zementartiges Material enthalten, z.B. Putzmörtel
,
SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
/
B28C
Tonaufbereitung
,
PREPARING CLAY
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