JP3540515B2 - Method for producing β ″ -alumina - Google Patents
Method for producing β ″ -alumina Download PDFInfo
- Publication number
- JP3540515B2 JP3540515B2 JP21452596A JP21452596A JP3540515B2 JP 3540515 B2 JP3540515 B2 JP 3540515B2 JP 21452596 A JP21452596 A JP 21452596A JP 21452596 A JP21452596 A JP 21452596A JP 3540515 B2 JP3540515 B2 JP 3540515B2
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- JP
- Japan
- Prior art keywords
- alumina
- powder
- producing
- stoichiometric ratio
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Compositions Of Oxide Ceramics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Secondary Cells (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明はＡＭＴＥＣ（アルカリ金属熱電変換）材料、Ｎａ−Ｓ又はＮａ−Ｃｌ二次電池材料として使用されるβ″−アルミナの製造方法に関する。
【０００２】
【従来の技術】
従来のβ″−アルミナの製造方法を図２によって説明する。
β″−アルミナはＮａ2 ＣＯ3 及びＡｌ2 Ｏ3 を出発原料１１にする。Ｎａ2 Ｏが蒸発するのを考慮に入れて所定の化学量論比でエタノール中で２０時間混合１２させる。混合１２後、さらに８００〜１０００℃で大気中１時間加熱し有機物質を蒸発させ予備焼成１３する。その後乳鉢で荒粉砕、成形１４し、最後に１６００℃で加熱１５することにより、所定の化学量論比のβ″−アルミナを得ている。
【０００３】
【発明が解決しようとする課題】
従来の方法では、高温で合成するためにＮａなどが蒸発し化学量論比からずれて所定の性能を発揮できない問題点があった。本発明はこのような問題点を解消しうるβ″−アルミナの製造方法を提供しようとするものである。
【０００４】
【課題を解決するための手段】
本発明は合金製造にしばしば採用されるメカニカルアロイング法を採用することによって、従来法の問題点を解消したものであって、Ｎａ2 Ｏ粉体とＡｌ2 Ｏ3 粉体を化学量論比になるように配合し、該配合物を不活性雰囲気下で硬質ボールによりＮａ2 Ｏ粉体とＡｌ2 Ｏ3 粉体との反応が始まるまで十分粉砕し反応させ、得られた粉砕物を大気雰囲気下、５００〜８００℃で所定時間加熱することを特徴とするβ″−アルミナの製造方法である。
【０００５】
（作用）
メカニカルアロイングは粉体成分を機械的に混合、粉砕して粉体成分を反応させる方法であるため、炭酸化合物などを必要とせず、β″−アルミナの構成成分を化学量論比に混合することで反応化できる。そのため、低温加熱で結晶化できるのでＮａなどが蒸発し化学量論比からずれることがない。
【０００６】
【実施例】
本発明の一実施例を図１によって説明する。Ｎａ2 ＯとＡｌ2 Ｏ3 酸化物粉体をそれぞれ化学量論比で１：５．３３になるように秤量０１する。この秤量したものをステンレスポットに入れ、粉砕用のジルコニアボールを原料の重量の５０倍入れ、蓋をして窒素雰囲気に置換して１００時間粉砕０２させる。得られた粉を８００℃で３時間大気中で加熱結晶化０３し、β″−アルミナを得る。
【０００７】
図３に、上記方法で得られた材料のｘ線回折図を示す。この図から得られた物質がβ″−アルミナであることが判明した。
【０００８】
【発明の効果】
本発明方法により、化学量論比から外れることなくβ″−アルミナが得られ、その工業的効果は顕著なものがある。
【図面の簡単な説明】
【図１】本発明の実施態様の工程図。
【図２】従来のβ″−アルミナの製造方法の一態様の工程図。
【図３】本発明の実施例で得られたβ″−アルミナのｘ線回折図。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing β ″ -alumina used as an AMTEC (alkali metal thermoelectric conversion) material, Na—S or Na—Cl secondary battery material.
[0002]
[Prior art]
A conventional method for producing β ″ -alumina will be described with reference to FIG.
β ″ -alumina is Na 2 CO 3 and Al 2 O 3 as starting
[0003]
[Problems to be solved by the invention]
In the conventional method, there is a problem in that Na or the like evaporates due to synthesis at a high temperature, deviates from the stoichiometric ratio, and a predetermined performance cannot be exhibited. An object of the present invention is to provide a method for producing β ″ -alumina which can solve such problems.
[0004]
[Means for Solving the Problems]
The present invention has solved the problems of the conventional method by adopting a mechanical alloying method often employed in alloy production, wherein Na 2 O powder and Al 2 O 3 powder are stoichiometrically mixed. And pulverize the mixture sufficiently in an inert atmosphere with a hard ball until the reaction between the Na 2 O powder and the Al 2 O 3 powder starts to react. A process for producing β ″ -alumina, comprising heating at 500 to 800 ° C. for a predetermined time in an atmosphere.
[0005]
(Action)
Mechanical alloying is a method in which powder components are mechanically mixed and pulverized to react the powder components. Therefore, a carbonic acid compound is not required, and the components of β ″ -alumina are mixed in a stoichiometric ratio. Therefore, it can be crystallized by heating at a low temperature, so that Na or the like does not evaporate and does not deviate from the stoichiometric ratio.
[0006]
【Example】
One embodiment of the present invention will be described with reference to FIG. Na 2 O and Al 2 O 3 oxide powder are each weighed 01 so as to have a stoichiometric ratio of 1: 5.33. The weighed material is placed in a stainless steel pot, and zirconia balls for grinding are placed 50 times the weight of the raw material. The lid is replaced with a nitrogen atmosphere, and crushed 02 for 100 hours. The obtained powder is crystallized by heating at 800 ° C. for 3 hours in the air to obtain β ″ -alumina.
[0007]
FIG. 3 shows an x-ray diffraction diagram of the material obtained by the above method. From this figure, it was found that the substance obtained was β ″ -alumina.
[0008]
【The invention's effect】
According to the method of the present invention, β ″ -alumina can be obtained without deviating from the stoichiometric ratio, and its industrial effect is remarkable.
[Brief description of the drawings]
FIG. 1 is a process diagram of an embodiment of the present invention.
FIG. 2 is a process chart of one embodiment of a conventional method for producing β ″ -alumina.
FIG. 3 is an x-ray diffraction diagram of β ″ -alumina obtained in an example of the present invention.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21452596A JP3540515B2 (en) | 1996-08-14 | 1996-08-14 | Method for producing β ″ -alumina |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21452596A JP3540515B2 (en) | 1996-08-14 | 1996-08-14 | Method for producing β ″ -alumina |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1059714A JPH1059714A (en) | 1998-03-03 |
| JP3540515B2 true JP3540515B2 (en) | 2004-07-07 |
Family
ID=16657173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21452596A Expired - Fee Related JP3540515B2 (en) | 1996-08-14 | 1996-08-14 | Method for producing β ″ -alumina |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3540515B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101213481B1 (en) | 2010-12-06 | 2012-12-20 | 삼성에스디아이 주식회사 | Beta alumina solid electrolyte and manufacturing method thereof |
-
1996
- 1996-08-14 JP JP21452596A patent/JP3540515B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1059714A (en) | 1998-03-03 |
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