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Static sintering process and method for preparing high-purity aluminum oxide
The static sintering process comprises the following steps: putting high-purity aluminum hydroxide, ammonium fluoride and a dispersing agent into a ball mill for ball milling, and then drying to obtain an aluminum hydroxide sample; calcining the aluminum hydroxide sample in a roller kiln to obtain an aluminum oxide sintered body; placing the alumina sintered body in a ball mill, and grinding to obtain alumina sintered powder; performing cold isostatic pressing on the aluminum oxide sintered powder to obtain a formed blank; placing the formed blank in a high-vacuum environment for microwave sintering to prepare high-purity aluminum oxide; when the blank is sintered through high vacuum and microwaves, the synergistic effect is beneficial to sintering, so that some properties of the prepared high-purity aluminum oxide can be enhanced; ammonium fluoride is introduced into aluminum hydroxide, so that the crystallization mode of aluminum oxide can be changed, an aluminum-containing gas phase can be formed at a relatively lower temperature, the transformation promotion effect is more obvious, and energy consumption is reduced.
本发明提出一种高纯氧化铝制备用静态烧结工艺及方法，包括以下步骤：将高纯氢氧化铝、氟化铵和分散剂置于球磨机内球磨后烘干，得到氢氧化铝样品；将氢氧化铝样品置于辊道窑内进行煅烧后制得氧化铝烧结体；将氧化铝烧结体再置于球磨机内，研磨后制得氧化铝烧结粉体；将氧化铝烧结粉体经冷等静压成型制得成型胚体；将成型胚体置入高真空环境内进行微波烧结，制得高纯氧化铝；通过高真空和微波对胚体进行烧结时其产生的协同作用有利于烧结的进行可以使制备高纯氧化铝的一些性能进行增强；通过向氢氧化铝中引入氟化铵可以改变氧化铝的结晶方式使其可以在相对更低的温度下形成含铝气相，使其转变的促进作用更明显，节约能源的消耗。
Static sintering process and method for preparing high-purity aluminum oxide
The static sintering process comprises the following steps: putting high-purity aluminum hydroxide, ammonium fluoride and a dispersing agent into a ball mill for ball milling, and then drying to obtain an aluminum hydroxide sample; calcining the aluminum hydroxide sample in a roller kiln to obtain an aluminum oxide sintered body; placing the alumina sintered body in a ball mill, and grinding to obtain alumina sintered powder; performing cold isostatic pressing on the aluminum oxide sintered powder to obtain a formed blank; placing the formed blank in a high-vacuum environment for microwave sintering to prepare high-purity aluminum oxide; when the blank is sintered through high vacuum and microwaves, the synergistic effect is beneficial to sintering, so that some properties of the prepared high-purity aluminum oxide can be enhanced; ammonium fluoride is introduced into aluminum hydroxide, so that the crystallization mode of aluminum oxide can be changed, an aluminum-containing gas phase can be formed at a relatively lower temperature, the transformation promotion effect is more obvious, and energy consumption is reduced.
本发明提出一种高纯氧化铝制备用静态烧结工艺及方法，包括以下步骤：将高纯氢氧化铝、氟化铵和分散剂置于球磨机内球磨后烘干，得到氢氧化铝样品；将氢氧化铝样品置于辊道窑内进行煅烧后制得氧化铝烧结体；将氧化铝烧结体再置于球磨机内，研磨后制得氧化铝烧结粉体；将氧化铝烧结粉体经冷等静压成型制得成型胚体；将成型胚体置入高真空环境内进行微波烧结，制得高纯氧化铝；通过高真空和微波对胚体进行烧结时其产生的协同作用有利于烧结的进行可以使制备高纯氧化铝的一些性能进行增强；通过向氢氧化铝中引入氟化铵可以改变氧化铝的结晶方式使其可以在相对更低的温度下形成含铝气相，使其转变的促进作用更明显，节约能源的消耗。
Static sintering process and method for preparing high-purity aluminum oxide
一种高纯氧化铝制备用静态烧结工艺及方法
SHI HENGYE (author) / ZHANG WEIBO (author) / HAN KEXUE (author)
2023-03-28
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Equipment for preparing pure white high-purity aluminum oxide ceramic
| European Patent Office | 2020