Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of high-transparency Al2O3 polycrystalline ceramic
The invention discloses a preparation method of high-transparency Al2O3 polycrystalline ceramic, which is characterized in that under the action of a small amount of ZrO2 sintering aid, birefringence of Al2O3 transparent ceramic is inhibited by using a grain boundary phase, and preparation of Al2O3 ceramic without birefringence is realized by adopting vacuum presintering and hot isostatic pressing sintering. The method comprises the following specific steps: preparing slurry; the preparation method comprises the following steps: carrying out ball milling, drying, grinding, sieving, calcining and forming to obtain a ceramic green body, carrying out vacuum pre-sintering on the ceramic green body, carrying out hot isostatic pressing sintering, and finally polishing to obtain the Al2O3 polycrystalline ceramic. According to the method, optical distortion (birefringence) minimization can be effectively controlled, crystal grain growth can be effectively controlled, the mechanical performance of the ceramic is greatly improved, the prepared transparent ceramic has an optically anisotropic hexagonal crystal structure, meanwhile, excellent mechanical and isotropic optical performance is obtained, and the transparent ceramic can be widely applied to the field of transparent ceramics. And high energy consumption and high equipment requirements of ultrahigh-pressure sintering are avoided.
本发明公开了一种高透明Al2O3多晶陶瓷的制备方法，在少量ZrO2烧结助剂作用下，利用晶界相抑制Al2O3透明陶瓷的双折射，采用真空预烧结+热等静压烧结实现了无双折射的Al2O3陶瓷的制备。具体步骤包括：浆料配制；球磨、烘干、研磨、过筛、煅烧、成型得到陶瓷坯体，然后将陶瓷坯体先真空预烧，再热等静压烧结，最后抛光得到Al2O3多晶陶瓷。本方法能够有效控制光学失真(双折射)最小化，并且能够有效控制晶粒生长，大大提高了陶瓷的机械性能，所制备得到的透明陶瓷具有光学各向异性的六方晶体结构，同时获得了优异的力学和各向同性光学性能，避免了超高压烧结的高能耗及高设备要求。
Preparation method of high-transparency Al2O3 polycrystalline ceramic
The invention discloses a preparation method of high-transparency Al2O3 polycrystalline ceramic, which is characterized in that under the action of a small amount of ZrO2 sintering aid, birefringence of Al2O3 transparent ceramic is inhibited by using a grain boundary phase, and preparation of Al2O3 ceramic without birefringence is realized by adopting vacuum presintering and hot isostatic pressing sintering. The method comprises the following specific steps: preparing slurry; the preparation method comprises the following steps: carrying out ball milling, drying, grinding, sieving, calcining and forming to obtain a ceramic green body, carrying out vacuum pre-sintering on the ceramic green body, carrying out hot isostatic pressing sintering, and finally polishing to obtain the Al2O3 polycrystalline ceramic. According to the method, optical distortion (birefringence) minimization can be effectively controlled, crystal grain growth can be effectively controlled, the mechanical performance of the ceramic is greatly improved, the prepared transparent ceramic has an optically anisotropic hexagonal crystal structure, meanwhile, excellent mechanical and isotropic optical performance is obtained, and the transparent ceramic can be widely applied to the field of transparent ceramics. And high energy consumption and high equipment requirements of ultrahigh-pressure sintering are avoided.
本发明公开了一种高透明Al2O3多晶陶瓷的制备方法，在少量ZrO2烧结助剂作用下，利用晶界相抑制Al2O3透明陶瓷的双折射，采用真空预烧结+热等静压烧结实现了无双折射的Al2O3陶瓷的制备。具体步骤包括：浆料配制；球磨、烘干、研磨、过筛、煅烧、成型得到陶瓷坯体，然后将陶瓷坯体先真空预烧，再热等静压烧结，最后抛光得到Al2O3多晶陶瓷。本方法能够有效控制光学失真(双折射)最小化，并且能够有效控制晶粒生长，大大提高了陶瓷的机械性能，所制备得到的透明陶瓷具有光学各向异性的六方晶体结构，同时获得了优异的力学和各向同性光学性能，避免了超高压烧结的高能耗及高设备要求。
Preparation method of high-transparency Al2O3 polycrystalline ceramic
一种高透明Al2O3多晶陶瓷的制备方法
ZHANG LE (Autor:in) / ZHENG XINYU (Autor:in) / ZHOU TIANYUAN (Autor:in) / WANG SIQING (Autor:in) / CAO YIFEI (Autor:in) / SHAO CEN (Autor:in) / KANG JIAN (Autor:in) / ZHOU CHUNMING (Autor:in) / CHEN HAO (Autor:in)
04.04.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
High-transparency bismuth layered ferroelectric ceramic and preparation method thereof
| Europäisches Patentamt | 2023
| British Library Online Contents | 2018
| British Library Online Contents | 2018