JPH10338566A - Ceramic sliding member with high hydrophilicity and low friction - Google Patents
Ceramic sliding member with high hydrophilicity and low frictionInfo
- Publication number
- JPH10338566A JPH10338566A JP9163365A JP16336597A JPH10338566A JP H10338566 A JPH10338566 A JP H10338566A JP 9163365 A JP9163365 A JP 9163365A JP 16336597 A JP16336597 A JP 16336597A JP H10338566 A JPH10338566 A JP H10338566A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- sliding member
- aluminate
- ceramic sliding
- low friction
- 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
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は水道の蛇口などの開
閉弁に使用される高親水性低摩擦セラミツクス摺動部材
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-hydrophilic low-friction ceramic sliding member used for an on-off valve of a water tap or the like.
【０００２】[0002]
【従来の技術】従来、特開平６−９３２７７号公報や特
開平７−１０８７７４号公報などに開示されるように、
水中における摩擦係数を低減するための材料として、ア
ルミナ材料の表面にダイヤモンドライクカーボンを被覆
したもの、アルミナ材料の表面に炭化ケイ素とカーボン
との混合物を被覆したもの、水溜めとなる多数の気孔が
均一に分散するセラミツクス、固体潤滑材、油含浸型セ
ラミツクスなどが知られている。しかし、上述した従来
の材料は強度が不十分であり、潤滑の役目を果たす被覆
が剥がれやすい、コストが高いなどの難点がある。2. Description of the Related Art Conventionally, as disclosed in JP-A-6-93277 and JP-A-7-108774,
As a material for reducing the coefficient of friction in water, a material coated with diamond-like carbon on the surface of an alumina material, a material coated with a mixture of silicon carbide and carbon on the surface of an alumina material, and a number of pores serving as a water reservoir are provided. Known are ceramics, solid lubricants, and oil-impregnated ceramics that are uniformly dispersed. However, the above-mentioned conventional materials are insufficient in strength, and have disadvantages such as a coating which plays a role of lubrication is easily peeled off and the cost is high.
【０００３】[0003]
【発明が解決しようとする課題】本発明の課題は上述の
問題に鑑み、製造経費が低廉で、機械的強度と摩擦特性
が優れた、高親水性低摩擦セラミツクス摺動部材を提供
することにある。SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a highly hydrophilic low friction ceramic sliding member which is inexpensive to manufacture and has excellent mechanical strength and friction characteristics. is there.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明の構成はαアルミナ（α−Al2O3 ）の母相中
に、アルミナ（Al2O3 ）と同様の粒子径の無水アルミン
酸塩（MAl2O4）スピネル型結晶構造の複合酸化物粒子
が、固溶体または化合物として均一に分散していること
を特徴とする。In order to solve the above problems SUMMARY OF THE INVENTION, in a mother phase structure of the present invention is alpha-alumina (α-Al 2 O 3) , the same particle diameter as alumina (Al 2 O 3) The composite oxide particles having an anhydrous aluminate (MAl 2 O 4 ) spinel type crystal structure are uniformly dispersed as a solid solution or a compound.
【０００５】[0005]
【発明の実施の形態】アルミナ（Al2O3 ）に、無水アル
ミン酸塩（MAl2O4）を生成し得る２価の金属化合物を添
加して焼成することにより、アルミナ（Al2O3 ）の母相
中に無水アルミン酸塩（MAl2O4）を分散させる。これに
より、セラミツクス焼結体として、高い水吸着性と水存
在下での低摩擦性とを発揮し、摺動部材に適する。DETAILED DESCRIPTION OF THE INVENTION Alumina (Al 2 O 3), followed by baking by adding divalent metal compound capable of forming anhydride aluminate (MAl 2 O 4), alumina (Al 2 O 3 ( 2 ) Disperse anhydrous aluminate (MAl 2 O 4 ) in the parent phase. Thereby, as a ceramic sintered body, it exhibits high water absorption and low friction in the presence of water, and is suitable for a sliding member.
【０００６】[0006]
【実施例】本発明による高親水性低摩擦セラミツクス摺
動部材は、アルミナ（Al2O3 ）に無水アルミン酸塩（MA
l2O4）を生成し得る２価の金属化合物を添加したうえ、
焼成して得られるものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS A high hydrophilic low friction ceramic sliding member according to the present invention is obtained by adding anhydrous aluminate (MA) to alumina (Al 2 O 3 ).
After adding a divalent metal compound capable of producing l 2 O 4 ),
It is obtained by firing.
【０００７】図１に示すように、得られたセラミツクス
摺動部材としての焼結体は、αアルミナ（α−Al2O3 ）
の母相２の内部に、アルミナ（Al2O3 ）と同様の粒子径
の無水アルミン酸塩（MAl2O4）スピネル型結晶構造の複
合酸化物粒子３が、固溶体ま本発明による高親水性低摩
擦セラミツクス摺動部材は、アルミナ（Al2O3 ）にたは
化合物として均一に分散している。ここで、M はAl2O3
と化合して塩を生成する金属元素を代表する。As shown in FIG. 1, the obtained sintered body as a ceramic sliding member is α-alumina (α-Al 2 O 3 ).
In the mother phase 2 of the above, complex oxide particles 3 having a spinel type crystal structure of anhydrous aluminate (MAl 2 O 4 ) having a particle size similar to that of alumina (Al 2 O 3 ) are formed into a solid solution or highly hydrophilic according to the present invention. The low-friction ceramic sliding member is uniformly dispersed as alumina (Al 2 O 3 ) or a compound. Where M is Al 2 O 3
And a metal element that forms a salt when combined with
【０００８】前記セラミツクス摺動部材に対する無水ア
ルミン酸塩（MAl2O4）の含有量は５〜５０wt％である。
化学式MAl2O4で表される無水アルミン酸塩の金属M は、
マグネシウム（Mg），亜鉛（Zn），コバルト（Co），ニ
ツケル（Ni），銅（Cu），マンガン（Mn），鉄（Fe）の
内の少くとも１つから構成される。The content of anhydrous aluminate (MAl 2 O 4 ) in the ceramic sliding member is 5 to 50% by weight.
The metal M of the anhydrous aluminate represented by the chemical formula MAl 2 O 4 is
It is composed of at least one of magnesium (Mg), zinc (Zn), cobalt (Co), nickel (Ni), copper (Cu), manganese (Mn), and iron (Fe).
【０００９】［実施例１］アルミナ（Al2O3 ）粉末を主
原料とし、Mg，Zn，Co，Ni，Cu，Mn，Feの内の１つの金
属酸化物を１０wt％添加し、さらに焼結助剤を少量添加
し、成形体を作製した。該成形体を温度１３００〜１６
００℃の大気中にて焼成して、焼結体（試料）を得た。
図１は得られた本発明の焼結体の組織を表す模式図を示
す。本発明の焼結体（試料）から直径３５mm、厚さ５mm
の円板状の試験片を作製し、該試験片の表面をラツプ仕
上げにより、表面粗さRmax０．４以下の平面に平滑化し
た。得られた２枚の試験片を互いに重ね合せ、温度２５
℃の水中にて摺動試験を行い、摩擦係数を測定した。[Example 1] Alumina (Al 2 O 3 ) powder was used as a main raw material, and a metal oxide of one of Mg, Zn, Co, Ni, Cu, Mn and Fe was added in an amount of 10 wt%, and further calcined. A small amount of a binder was added to produce a molded body. The molded body was heated at a temperature of 1300-16
It was fired in the atmosphere of 00 ° C. to obtain a sintered body (sample).
FIG. 1 is a schematic diagram showing the structure of the obtained sintered body of the present invention. 35mm in diameter and 5mm in thickness from the sintered body (sample) of the present invention
Was prepared, and the surface of the test piece was flattened by lapping to a flat surface having a surface roughness Rmax of 0.4 or less. The two test pieces obtained were superimposed on each other, and the temperature was 25
A sliding test was performed in water at ℃, and the friction coefficient was measured.
【００１０】図２から明らかなように、本発明の焼結体
（試料）はアルミナ（Al2O3 ）中に無水アルミン酸塩
（MAl2O4）を形成させることにより、アルミナ単体より
も水中での摩擦係数が小さく、水吸着性が高いことが確
認された。この理由は、無水アルミン酸塩（MAl2O4）ス
ピネル構造化合物の陽イオンが配位していない空孔が極
性を呈し、水を強く吸着することによる。As is apparent from FIG. 2, the sintered body (sample) of the present invention is formed by forming anhydrous aluminate (MAl 2 O 4 ) in alumina (Al 2 O 3 ), so that the alumina (Al 2 O 4 ) can be formed more easily than alumina alone. It was confirmed that the coefficient of friction in water was small and the water absorption was high. The reason for this is that vacancies to which the cation of the anhydrous aluminate (MAl 2 O 4 ) spinel structure compound is not coordinated exhibit polarity and strongly adsorb water.
【００１１】［実施例２］アルミナ（Al2O3 ）粉末を主
原料とし、酸化亜鉛（ZnO ）の添加量を変えて、アルミ
ン酸亜鉛（ZnAl2O4 ）の含有量が異なる１０種の焼結体
（試料）を、実施例１と同様にして作製し、各焼結体
（試料）の摺動特性と強度を測定した。[Example 2] Ten kinds of zinc aluminate (ZnAl 2 O 4 ) with different contents of zinc oxide (ZnO 2 ) were used by using alumina (Al 2 O 3 ) powder as a main raw material and changing the addition amount of zinc oxide (ZnO 2 ). A sintered body (sample) was prepared in the same manner as in Example 1, and the sliding characteristics and strength of each sintered body (sample) were measured.
【００１２】図３から明らかなように、本発明による焼
結体（試料）は、アルミン酸亜鉛（ZnAl2O4 ）の含有量
が多くなるにつれて摩擦係数が小さくなることが分る。
本発明によれば、焼結体に占めるアルミン酸亜鉛（ZnAl
2O4 ）の含有量が１０〜５５wt％の時、摩擦係数が０．
３以下の良好な摺動特性を示す。本発明による焼結体の
強度に関しては、焼結体に占めるアルミン酸亜鉛（ZnAl
2O4 ）の含有量が多くなるにつれて強度が徐々に低下
し、焼結体に占めるアルミン酸亜鉛（ZnAl2O4 ）の含有
量が５０％を超えると、強度は著しく低下し、摺動部材
としての使用に適さなくなる。As is clear from FIG. 3, the sintered body (sample) according to the present invention has a smaller coefficient of friction as the content of zinc aluminate (ZnAl 2 O 4 ) increases.
According to the present invention, zinc aluminate (ZnAl
When the content of 2 O 4 ) is 10 to 55% by weight, the friction coefficient is 0.1%.
It shows good sliding characteristics of 3 or less. Regarding the strength of the sintered body according to the present invention, zinc aluminate (ZnAl
As the content of 2 O 4 ) increases, the strength gradually decreases. When the content of zinc aluminate (ZnAl 2 O 4 ) in the sintered body exceeds 50%, the strength decreases significantly, It is not suitable for use as a member.
【００１３】[0013]
【発明の効果】本発明は上述のように、αアルミナ（α
−Al2O3 ）の母相中に、アルミナ（Al2O3 ）と同様の粒
子径の無水アルミン酸塩（MAl2O4）スピネル型結晶構造
の複合酸化物粒子が、固溶体または化合物として均一に
分散しているものであるから、高い親水性を有し、水存
在下にて低摩擦性と低摩耗性を有するアルミナ系セラミ
ツクス摺動部材が得られる。According to the present invention, as described above, α-alumina (α
-Al 2 O 3 ), a composite oxide particle having a spinel type crystal structure of anhydrous aluminate (MAl 2 O 4 ) having a particle size similar to that of alumina (Al 2 O 3 ) is formed as a solid solution or a compound. Since they are uniformly dispersed, an alumina-based ceramic sliding member having high hydrophilicity and low friction and low wear in the presence of water can be obtained.
【図１】本発明に係る高親水性低摩擦セラミツクス摺動
部材を構成する焼結体の組織を模式的に表す組織図であ
る。FIG. 1 is a schematic diagram schematically showing the structure of a sintered body constituting a high hydrophilic low friction ceramic sliding member according to the present invention.
【図２】同セラミツクス摺動部材に含まれる無水アルミ
ン酸塩（MAl2O4）と摩擦係数の関係を表す線図である。FIG. 2 is a diagram showing a relationship between anhydrous aluminate (MAl 2 O 4 ) and a coefficient of friction contained in the ceramic sliding member.
【図３】同セラミツクス摺動部材に含まれる無水アルミ
ン酸塩（MAl2O4）の含有量と、摩擦係数および強度との
関係をそれぞれ表す線図である。FIG. 3 is a diagram showing the relationship between the content of anhydrous aluminate (MAl 2 O 4 ) contained in the ceramic sliding member, and the friction coefficient and strength.
２：母相 ３：複合酸化物粒子 2: matrix phase 3: composite oxide particles
Claims (4)
ルミナ（Al2O3 ）と同様の粒子径の無水アルミン酸塩
（MAl2O4）スピネル型結晶構造の複合酸化物粒子が、固
溶体または化合物として均一に分散していることを特徴
とする、高親水性低摩擦セラミツクス摺動部材。In a mother phase of claim 1] alpha-alumina (α-Al 2 O 3) , alumina (Al 2 O 3) and similar anhydride aluminate particle size (MAl 2 O 4) composite spinel type crystal structure A highly hydrophilic low-friction ceramic sliding member, wherein the oxide particles are uniformly dispersed as a solid solution or a compound.
シウム（Mg），亜鉛（Zn），コバルト（Co），ニツケル
（Ni），銅（Cu），マンガン（Mn），鉄（Fe）の内の１
つから構成される、請求項１に記載の高親水性低摩擦セ
ラミツクス摺動部材。2. An anhydrous aluminate (MAl 2 O 4 ) comprising magnesium (Mg), zinc (Zn), cobalt (Co), nickel (Ni), copper (Cu), manganese (Mn), iron (Fe) One of the
The high hydrophilic low friction ceramic sliding member according to claim 1, comprising:
が５〜５０wt％である、請求項１に記載の高親水性低摩
擦セラミツクス摺動部材。3. The sliding member according to claim 1, wherein the content of the anhydrous aluminate (MAl 2 O 4 ) is 5 to 50 wt%.
いて使用される、請求項１に記載の高親水性低摩擦セラ
ミツクス摺動部材。4. The highly hydrophilic and low friction ceramic sliding member according to claim 1, wherein said ceramic sliding member is used in the presence of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9163365A JPH10338566A (en) | 1997-06-04 | 1997-06-04 | Ceramic sliding member with high hydrophilicity and low friction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9163365A JPH10338566A (en) | 1997-06-04 | 1997-06-04 | Ceramic sliding member with high hydrophilicity and low friction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10338566A true JPH10338566A (en) | 1998-12-22 |
Family
ID=15772507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9163365A Pending JPH10338566A (en) | 1997-06-04 | 1997-06-04 | Ceramic sliding member with high hydrophilicity and low friction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10338566A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1006090A1 (en) * | 1998-12-01 | 2000-06-07 | Isuzu Ceramics Research Co., Ltd. | Highly hydrophilic and low friction ceramic sliding member |
| JP2002234106A (en) * | 2000-11-20 | 2002-08-20 | Inax Corp | Base material with antistaining layer |
| JP2010019320A (en) * | 2008-07-09 | 2010-01-28 | Mikuni Corp | Sliding member and valve device |
-
1997
- 1997-06-04 JP JP9163365A patent/JPH10338566A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1006090A1 (en) * | 1998-12-01 | 2000-06-07 | Isuzu Ceramics Research Co., Ltd. | Highly hydrophilic and low friction ceramic sliding member |
| JP2002234106A (en) * | 2000-11-20 | 2002-08-20 | Inax Corp | Base material with antistaining layer |
| JP2010019320A (en) * | 2008-07-09 | 2010-01-28 | Mikuni Corp | Sliding member and valve device |
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