JPS6364956A - Anticorrosive alumina sintered body - Google Patents
Anticorrosive alumina sintered bodyInfo
- Publication number
- JPS6364956A JPS6364956A JP61207799A JP20779986A JPS6364956A JP S6364956 A JPS6364956 A JP S6364956A JP 61207799 A JP61207799 A JP 61207799A JP 20779986 A JP20779986 A JP 20779986A JP S6364956 A JPS6364956 A JP S6364956A
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- alumina
- alumina sintered
- corrosion resistance
- anticorrosive
- 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.)
- Pending
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims description 18
- 230000007797 corrosion Effects 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 17
- 238000005245 sintering Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、構造物、機械部品、治工具等の基本材料とし
て知られるアルミナ焼結体に関し、特にその耐食性を改
善したものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an alumina sintered body known as a basic material for structures, machine parts, jigs and tools, etc., and particularly relates to an improved corrosion resistance thereof.
［従来の技術］
アルミナは従来から強度が高く、耐摩耗性に優れまた、
耐食性が良く、化学的に安定な性質を有する基本材料と
して一般的に知られている。[Conventional technology] Alumina has traditionally had high strength and excellent wear resistance.
It is generally known as a basic material with good corrosion resistance and chemically stable properties.
［発明が解決しようとする問題点コ
アルミナの耐食性は、アルミナの原料中に含まれる不純
物の種類と量あるいはアルミナを焼結させるための助剤
の種類と量によって異なり、助剤量が多い程、耐食性が
悪化、特に耐アルカリ性に対して顕著に現われる。その
ため、耐食性の良い焼結体を１ｑるにはできるだけ助剤
量を少なくして、アルミナの純度の高い材料を使用する
必要がある。しかし、一般にアルミナ成形体を常圧高温
下で緻密化させるためには、焼結助剤は不可欠なものと
されている。[Problems to be Solved by the Invention The corrosion resistance of core alumina varies depending on the type and amount of impurities contained in the alumina raw material or the type and amount of the auxiliary agent for sintering the alumina. Corrosion resistance deteriorates, especially in alkali resistance. Therefore, in order to produce a sintered body with good corrosion resistance, it is necessary to reduce the amount of auxiliary agent as much as possible and use a material with high purity of alumina. However, in order to densify an alumina compact under normal pressure and high temperature, a sintering aid is generally considered to be indispensable.
ところで、アルミナの耐食性は粒界に存在するガラス相
によって決まり、粒界相の制御が必要である。市販の一
般アルミナ（純度９８％以上）では原料中に含まれる不
純物量が多く、期待するような耐食性を引き出すことは
かなり困難である。特に、不純物や焼結助剤中に０８分
が存在する場合、アルミナ焼結体の耐食性が悪化する原
因となる。したがって、耐食性のあるアルミナ焼結体に
するにはアルミナの粒界に存在するガラス相を耐食性の
ある組成にする必要がある。By the way, the corrosion resistance of alumina is determined by the glass phase present in the grain boundaries, and it is necessary to control the grain boundary phases. Commercially available general alumina (purity of 98% or more) contains a large amount of impurities in the raw material, making it quite difficult to achieve the expected corrosion resistance. In particular, when impurities or sintering aids contain 08%, it causes deterioration in the corrosion resistance of the alumina sintered body. Therefore, in order to make an alumina sintered body with corrosion resistance, it is necessary to make the glass phase present in the grain boundaries of alumina have a corrosion-resistant composition.
［問題点を解決するための手段］
本発明は、焼結体中にＣａＯとＳｉＯ２とが共存するこ
となく、かつＣａＯ含有率が０．０５重量％以下である
ことを特徴とする耐食性アルミナ焼結体である。[Means for Solving the Problems] The present invention provides a corrosion-resistant alumina sintered body characterized in that CaO and SiO2 do not coexist in the sintered body and the CaO content is 0.05% by weight or less. It is a body.
すなわち、本発明は、第１にアルミナ原料をできるだけ
純度の高いものを利用する。そして焼結助剤としては一
般に使用されるものの中で、Ｍ（１１以外のアルカリ土
類金属元素、あるいはアルカリ金属元素を含むものは使
用しない。最適な焼結助剤としてはＭ（１１０とＳｉＯ
２を使用し、焼結体中のＣａＯの含有量を０．０５重量
％以下に限定する。これは、ＣａＯが５１０２と共存す
ることによって極度に耐食性が劣化することを見出した
ことによる。That is, the present invention first uses an alumina raw material with as high a purity as possible. Among the commonly used sintering aids, do not use alkaline earth metal elements other than M(11) or those containing alkali metal elements.The most suitable sintering aids are M(110 and SiO
2, and the content of CaO in the sintered body is limited to 0.05% by weight or less. This is because it has been found that the coexistence of CaO with 5102 causes an extreme deterioration in corrosion resistance.
［実施例］
つぎに実施例並びに比較例について本発明をざらに詳細
に説明する。[Example] Next, the present invention will be roughly described in detail with reference to Examples and Comparative Examples.
アルミナの純度９９．９９％を主原料とし、焼結助剤に
ＭＣｌ０．Ｓ ｉ ０２ 、ｃａｏを使用して、第１表
に示すように配合し、成形後１５５０〜１６５０℃で２
時間焼成して焼結体を得た。モして各焼結体を６規定の
塩酸中１００℃にて３３６時間浸漬させ、腐蝕減量を調
べた。その結果を第２表に示した。（腐蝕減損として１
．０Ｘ１０’ ｍｇ／Ｃｍ２ｈ「以下を耐食材料とする
。）
表１
表２
本発明は上記試験結果からも明らかなように、耐食性に
優れたアルミナ焼結体が得られる。The main raw material is alumina with a purity of 99.99%, and the sintering aid is MCl0. S i 02 and cao were mixed as shown in Table 1, and after molding, it was heated at 1550 to 1650°C
A sintered body was obtained by firing for a period of time. Each sintered body was immersed in 6N hydrochloric acid at 100° C. for 336 hours, and the weight loss due to corrosion was examined. The results are shown in Table 2. (1 as corrosion impairment loss)
．． 0X10' mg/Cm2h "The following are corrosion-resistant materials." Table 1 Table 2 As is clear from the above test results, the present invention provides an alumina sintered body with excellent corrosion resistance.
Claims (1)
かつＣａＯ含有率が０．０５重量％以下であることを特
徴とする耐食性アルミナ焼結体。CaO and SiO_2 do not coexist in the sintered body,
A corrosion-resistant alumina sintered body, characterized in that the CaO content is 0.05% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61207799A JPS6364956A (en) | 1986-09-05 | 1986-09-05 | Anticorrosive alumina sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61207799A JPS6364956A (en) | 1986-09-05 | 1986-09-05 | Anticorrosive alumina sintered body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6364956A true JPS6364956A (en) | 1988-03-23 |
Family
ID=16545684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61207799A Pending JPS6364956A (en) | 1986-09-05 | 1986-09-05 | Anticorrosive alumina sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6364956A (en) |
-
1986
- 1986-09-05 JP JP61207799A patent/JPS6364956A/en active Pending
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