Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Liquid-phase sintering slip casting SiC ceramic valve material and preparation method thereof
The invention discloses a liquid-phase sintering slip casting SiC ceramic valve material and a preparation method thereof. The technical principle of the invention comprises that: coarse, medium and fine silicon carbide micro-powder with different particle sizes is adopted for grain composition so as to improve the bulk density of a slip casting green body; silicon powder and carbon powder are simultaneously added into a formula, the temperature is kept at 1400-1600 DEG C, so that in-situ reaction is carried out on the added silicon powder, the added carbon powder and carbon generated by cracking to generate silicon carbide, and densification of a whisker or fiber-containing toughened SiC ceramic composite material is promoted; and then heating is continued, the temperature is kept at 1750-1900 DEG C, so Al2O3 and Y2O3 are subjected to a reaction to form a YAG liquid phase, densification is further promoted, and the synergistic toughening effect of YAG and whiskers or fibers is exerted. The problems that a valve material with a relatively complex shape cannot be prepared through hot pressing sintering, the performance is anisotropic, a compact SiC ceramic composite material containing whisker or fiber toughening is not easy to prepare through normal pressure sintering, more carbon is not suitable to be added in liquid phase sintering, and more residual silicon is contained in reactive sintering are solved.
本发明公开了一种液相烧结注浆成型SiC陶瓷阀件材料及其制备方法。本发明技术原理是：采用三种不同粒径的粗、中、细碳化硅微粉进行颗粒级配，以提高注浆成型生坯的堆积密度；在配方中同时添加硅粉、碳粉，在1400‑1600℃保温，使添加的硅粉与添加的碳粉和裂解产生的碳原位反应生成碳化硅，促进含晶须或纤维增韧的SiC陶瓷复合材料致密化，然后继续升温，在1750‑1900℃之间保温，使Al2O3和Y2O3反应形成YAG液相，进一步促进致密化，发挥YAG与晶须或纤维的协同增韧作用。解决了热压烧结不能制备形状相对复杂的阀件材料且性能各向异性，常压烧结不易于制备致密的含晶须或纤维增韧的SiC陶瓷复合材料，液相烧结不宜添加较多碳以及反应烧结含有较多残留硅的问题。
Liquid-phase sintering slip casting SiC ceramic valve material and preparation method thereof
The invention discloses a liquid-phase sintering slip casting SiC ceramic valve material and a preparation method thereof. The technical principle of the invention comprises that: coarse, medium and fine silicon carbide micro-powder with different particle sizes is adopted for grain composition so as to improve the bulk density of a slip casting green body; silicon powder and carbon powder are simultaneously added into a formula, the temperature is kept at 1400-1600 DEG C, so that in-situ reaction is carried out on the added silicon powder, the added carbon powder and carbon generated by cracking to generate silicon carbide, and densification of a whisker or fiber-containing toughened SiC ceramic composite material is promoted; and then heating is continued, the temperature is kept at 1750-1900 DEG C, so Al2O3 and Y2O3 are subjected to a reaction to form a YAG liquid phase, densification is further promoted, and the synergistic toughening effect of YAG and whiskers or fibers is exerted. The problems that a valve material with a relatively complex shape cannot be prepared through hot pressing sintering, the performance is anisotropic, a compact SiC ceramic composite material containing whisker or fiber toughening is not easy to prepare through normal pressure sintering, more carbon is not suitable to be added in liquid phase sintering, and more residual silicon is contained in reactive sintering are solved.
本发明公开了一种液相烧结注浆成型SiC陶瓷阀件材料及其制备方法。本发明技术原理是：采用三种不同粒径的粗、中、细碳化硅微粉进行颗粒级配，以提高注浆成型生坯的堆积密度；在配方中同时添加硅粉、碳粉，在1400‑1600℃保温，使添加的硅粉与添加的碳粉和裂解产生的碳原位反应生成碳化硅，促进含晶须或纤维增韧的SiC陶瓷复合材料致密化，然后继续升温，在1750‑1900℃之间保温，使Al2O3和Y2O3反应形成YAG液相，进一步促进致密化，发挥YAG与晶须或纤维的协同增韧作用。解决了热压烧结不能制备形状相对复杂的阀件材料且性能各向异性，常压烧结不易于制备致密的含晶须或纤维增韧的SiC陶瓷复合材料，液相烧结不宜添加较多碳以及反应烧结含有较多残留硅的问题。
Liquid-phase sintering slip casting SiC ceramic valve material and preparation method thereof
一种液相烧结注浆成型SiC陶瓷阀件材料及其制备方法
HUANG QUAN (Autor:in) / LI QISONG (Autor:in) / MU YUNCHAO (Autor:in) / WANG ZHIXIN (Autor:in) / ZHANG QIAN (Autor:in) / JIA SHAOPEI (Autor:in) / CHENG XIAOZHE (Autor:in) / GUAN XIAOYAN (Autor:in)
25.06.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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