JPH07330443A - Ceramic sliding part and its production - Google Patents
Ceramic sliding part and its productionInfo
- Publication number
- JPH07330443A JPH07330443A JP7091891A JP9189195A JPH07330443A JP H07330443 A JPH07330443 A JP H07330443A JP 7091891 A JP7091891 A JP 7091891A JP 9189195 A JP9189195 A JP 9189195A JP H07330443 A JPH07330443 A JP H07330443A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- slurry
- raw material
- ceramic sliding
- metal component
- 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
- Sliding-Contact Bearings (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、セラミック摺動部品お
よびその製造方法に関し、特にボールベアリングなどに
好適なセラミック摺動部品およびその製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic sliding part and a manufacturing method thereof, and more particularly to a ceramic sliding part suitable for a ball bearing and the like and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】近年、耐摩耗性、耐熱性あるいは耐酸性
などの諸特性に優れたセラミック材料を、各種摺動部材
として用いることが試みられている。たとえば、セラミ
ック材料で構成されたボールベアリングは、金属のそれ
に比べて、運転中に潤滑油が切れても焼付きを起こさ
ず、また耐摩耗性に優れることから各種機械用のベアリ
ング部材として期待されている。2. Description of the Related Art In recent years, it has been attempted to use ceramic materials having various characteristics such as wear resistance, heat resistance and acid resistance as various sliding members. For example, a ball bearing made of a ceramic material is expected to be used as a bearing member for various machines because it does not cause seizure even if the lubricating oil runs out during operation and has excellent wear resistance as compared with that of metal. ing.
【０００３】従来、このような摺動部材を構成するセラ
ミック材料としては、機械的強度に優れた窒化ケイ素
系、炭化ケイ素系、アルミナ系、あるいは窒化チタン系
セラミック材料が主として用いられている。また、これ
らのセラミック材料を用いて摺動部品を製造する方法も
種々実施されている。たとえば、ボールベアリングを形
成する場合の一例を挙げると、まず所定の原料セラミッ
ク粉末をバインダーと共に混合して所定の手段で成形し
たのち、これを焼結し、必要な後処理を施すことにより
得られる。Conventionally, as a ceramic material constituting such a sliding member, a silicon nitride-based, silicon carbide-based, alumina-based or titanium nitride-based ceramic material excellent in mechanical strength has been mainly used. In addition, various methods for manufacturing sliding parts using these ceramic materials have been implemented. For example, as an example of forming a ball bearing, it is obtained by first mixing a predetermined raw material ceramic powder with a binder, molding the mixture by a predetermined means, sintering the mixture, and performing a necessary post-treatment. .
【０００４】[0004]
【発明が解決しようとする課題】従来の方法で得られる
摺動部品、たとえばボールベアリングは、その使用過程
において、短時間でボール表面に材料の剥離が生ずるも
のがしばしばあることが判明している。このような剥離
現象の出現はセラミック摺動部品にとっては致命的であ
り、部品の品質の安定性ならびに信頼性の点で問題とな
る。It has been found that the sliding parts obtained by the conventional method, such as ball bearings, often have material peeling on the ball surface in a short time during the use process. . The appearance of such a peeling phenomenon is fatal for ceramic sliding parts, and poses a problem in terms of stability and reliability of quality of the parts.
【０００５】本発明は上述した従来の技術の問題点に鑑
みてなされたものであり、剥離などの欠陥部が発生せず
安定した品質を有するセラミック摺動部品およびその製
造方法を提供することを目的とする。The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a ceramic sliding component having a stable quality without causing a defect such as peeling and a manufacturing method thereof. To aim.
【０００６】[0006]
【課題を解決するための手段および作用】本発明に係る
セラミック摺動部品は、セラミック材料中の金属成分の
含有量が３００ｐｐｍ以下であることを特徴としてい
る。Means and Actions for Solving the Problems The ceramic sliding component according to the present invention is characterized in that the content of the metal component in the ceramic material is 300 ppm or less.
【０００７】さらに本発明のセラミック摺動部品の製造
方法は、原料セラミック粉末をスラリー化したのち、こ
れを造粒し、所定形状に成形し、焼結するセラミック摺
動部品の製造方法において、セラミック摺動部品におけ
る含有金属成分の含有量が３００ｐｐｍ以下になるよう
に除去する工程を設けることを特徴としている。Further, in the method for producing a ceramic sliding component of the present invention, the raw material ceramic powder is slurried, then granulated, molded into a predetermined shape and sintered, and the ceramic sliding component is produced. It is characterized in that a step of removing the contained metal component in the sliding part is provided so as to be 300 ppm or less.
【０００８】本発明者らの研究によれば、摺動部品の使
用中に剥離が生じたものの表面をＸ線マイクロアナライ
ザによって分析した結果、当該剥離部分から多量の鉄
（Ｆｅ）が検出された。この事実に着目して更に研究し
たところ、原料セラミック材料中に不可避的に存在する
鉄に起因して、焼結時にこの鉄粒子を核とする何らかの
凝集現象が生じ、これが部品表面に析出して表面層に３
０〜１００μｍ程度の凝集体が形成されることが分かっ
た。この凝集体は剥離され易く、機械的応力に伴ってウ
ロコ状に剥離していき、これが摺動部品の品質低下の原
因となっていたのである。According to the research conducted by the present inventors, as a result of analyzing the surface of the sliding part, which had peeled off during use, by an X-ray microanalyzer, a large amount of iron (Fe) was detected from the peeled part. . Upon further study focusing on this fact, some agglomeration phenomenon with iron particles as cores occurred during sintering due to iron inevitably present in the raw ceramic material, and this was precipitated on the surface of the component. 3 on the surface layer
It was found that aggregates of about 0 to 100 μm were formed. This agglomerate is easily peeled off, and is peeled off in a scale-like manner due to mechanical stress, which causes the deterioration of the quality of the sliding parts.
【０００９】本発明は上記の知見に基づいてなされたも
のであり、セラミック材料中に不可避的に存在する上記
のような剥離の要因となる金属成分を積極的に排除する
ことを特徴としている。なお、上述したような部品表面
層での剥離現象は、鉄のみならず、Ｃｒ，Ｎｉ，Ｗなど
の金属成分においても同様に生じ、さらに、ＷＣなどの
金属化合物などの存在によっても生じ得る。したがっ
て、本発明においては、金属成分としては、このような
成分をも含むものとする。The present invention has been made on the basis of the above findings, and is characterized by positively eliminating the above-mentioned metal components that inevitably exist in the ceramic material and cause the above-mentioned delamination. The peeling phenomenon on the component surface layer as described above occurs not only in iron but also in metal components such as Cr, Ni and W, and may also occur due to the presence of a metal compound such as WC. Therefore, in the present invention, such a component is also included as the metal component.
【００１０】本発明のセラミック摺動部品を構成する原
料セラミック材料は、従来、摺動部品用の材料として用
いられているセラミックが適宜用いられ得る。具体的に
は、その用途に応じて、たとえば、窒化ケイ素系、炭化
ケイ素系、アルミナ系、あるいは窒化チタン系セラミッ
ク材料が用いられ、さらにこれらの混合材料も用いられ
得る。As a raw material ceramic material constituting the ceramic sliding component of the present invention, a ceramic which has been conventionally used as a material for sliding components can be appropriately used. Specifically, for example, a silicon nitride-based, silicon carbide-based, alumina-based, or titanium nitride-based ceramic material may be used, and a mixed material thereof may also be used, depending on the application.
【００１１】本発明のセラミック摺動部品を製造する場
合は、通常、まず原料セラミック粉末をスラリー化した
のち、これを造粒し、所定形状に成形し、焼結すること
によってセラミック摺動部品を得る方法が採られ得る
が、上記の工程の少なくとも一つの工程において含有金
属成分の実質的な除去を行う。When manufacturing the ceramic sliding part of the present invention, usually, the raw material ceramic powder is first slurried, then granulated, shaped into a predetermined shape and sintered to form the ceramic sliding part. The method of obtaining the metal component may be employed, but the metal component contained is substantially removed in at least one of the above steps.
【００１２】このような金属成分の積極的な除去は、た
とえば、原料セラミック粉末をスラリー化したのち、磁
石が装着されたスクリーンフィルタを用いて該スラリー
をろ過することによって行われ得る。[0012] Such positive removal of the metal component can be carried out, for example, by slurrying the raw material ceramic powder and then filtering the slurry using a screen filter equipped with a magnet.
【００１３】また、原料段階で金属成分を除去する方法
としては、たとえば、原料セラミック粉末をスラリー化
する前に、該原料セラミック粉末を磁石と接触させるこ
とによって、原料セラミック粉末中の金属成分を予め選
別し除去する方法が有効である。As a method of removing the metal component in the raw material stage, for example, before the raw ceramic powder is made into a slurry, the raw ceramic powder is brought into contact with a magnet to remove the metal component in the raw ceramic powder in advance. The method of selecting and removing is effective.
【００１４】さらにまた、前述したスラリーを所定方法
で造粒したのち、該造粒物を磁石と接触させることによ
って、造粒物中の金属成分を選別し除去する方法も有効
である。Furthermore, a method is also effective in which the above-mentioned slurry is granulated by a predetermined method and then the granulated product is brought into contact with a magnet to select and remove metal components in the granulated product.
【００１５】本発明においては、上述した種々の方法の
少なくとも１種、あるいは２種以上を組合わせて行うこ
とが肝要である。そして２種以上の方法あるいは複数回
除去をすることにより、金属成分の含有量をより低減す
ることができる。本発明においては、上記のような方法
を用いて、セラミック材料中の金属成分を実質的に除去
することが重要であるが、前述した剥離現象を実質的に
抑制するためには、材料中の鉄の含有量を２００ｐｐｍ
以下に制限することが好ましい。In the present invention, it is important to carry out at least one of the above-mentioned various methods or a combination of two or more thereof. Then, the content of the metal component can be further reduced by using two or more kinds of methods or by performing removal a plurality of times. In the present invention, it is important to substantially remove the metal component in the ceramic material by using the method as described above, but in order to substantially suppress the above-mentioned peeling phenomenon, 200ppm iron content
It is preferable to limit to the following.
【００１６】[0016]
【実施例】以下、実際の製造例に基づいて本発明を説明
するが、本発明は下記の実施例の記載に制限されるもの
ではない。EXAMPLES The present invention will be described below based on actual production examples, but the present invention is not limited to the description of the following examples.
【００１７】重量比で、Ｓｉ3 Ｎ4 ：１００部、Ｙ2 Ｏ
3 ：５部、Ａｌ2 Ｏ3 ：４部、ＡｌＮ：３部、Ｔｉ
Ｏ2 ：１．５部の割合で原料セラミック粉末を調合し、
溶剤、バインダーと共に混合、攪拌して原料スラリーを
調製した。By weight ratio, Si 3 N 4 : 100 parts, Y 2 O
3 : 5 parts, Al 2 O 3 : 4 parts, AlN: 3 parts, Ti
O 2 : The raw material ceramic powder was mixed at a ratio of 1.5 parts,
A raw material slurry was prepared by mixing and stirring with a solvent and a binder.
【００１８】次に、このスラリーを電磁石がその周囲に
装着されたスクリーンを用いて数回ろ過を繰り返した。
さらに、このろ過液を噴霧乾燥法によって造粒し、得ら
れた顆粒を加圧成形し、その後、添加したバインダーを
電気炉中で加熱分解昇華させてから焼結を行った。得ら
れた焼結物に必要に応じて若干の研磨加工を施して摺動
部品（ボールベアリング）を得た。Next, this slurry was repeatedly filtered several times using a screen having an electromagnet installed around it.
Further, the filtrate was granulated by a spray drying method, the obtained granules were pressure-molded, and then the added binder was thermally decomposed and sublimed in an electric furnace and then sintered. The obtained sintered product was slightly polished as necessary to obtain a sliding component (ball bearing).
【００１９】このようにして得られた本発明のボールベ
アリングならびに従来のボールベアリングについて、転
がり疲労寿命を測定したところ、従来のボールベアリン
グは平均４００時間、最短５０時間の寿命であったが、
本発明のボールベアリングでは平均４２０時間、最短３
００時間の寿命であった。測定条件は、荷重４００ｋ
ｇ、回転数１２００ｒｐｍ、ボール径１０ｍｍ、相手材
がＳＵＳ−２（円板）の条件で行った。The rolling fatigue life of the ball bearing of the present invention and the conventional ball bearing thus obtained was measured. The conventional ball bearing had an average life of 400 hours and a minimum of 50 hours.
The ball bearing of the present invention has an average of 420 hours and a minimum of 3 hours.
It had a life of 00 hours. Measurement condition is load 400k
g, rotation speed 1200 rpm, ball diameter 10 mm, and mating material SUS-2 (disc).
【００２０】上記の転がり疲労寿命測定の結果からも分
るように、本発明のセラミック摺動部品は、転がり疲労
寿命のばらつきが格段に減少し、品質が飛躍的に向上す
ることが認められた。As can be seen from the results of the rolling fatigue life measurement described above, it was found that the ceramic sliding parts of the present invention markedly reduce the variations in rolling fatigue life and dramatically improve the quality. .
【００２１】[0021]
【発明の効果】本発明のセラミック摺動部品において
は、セラミック材料中の金属成分が実質的に排除されて
いるので、摺動部品表面における剥離現象を効果的に防
止することができ、品質の安定性にすぐれている。In the ceramic sliding part of the present invention, since the metal component in the ceramic material is substantially eliminated, the peeling phenomenon on the surface of the sliding part can be effectively prevented and the quality of the sliding part can be improved. It has excellent stability.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ１６Ｃ 33/24 Ａ 7123−3Ｊ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location F16C 33/24 A 7123-3J
Claims (8)
００ｐｐｍ以下であることを特徴とするセラミック摺動
部品。1. The content of the metal component in the ceramic material is 3
Ceramic sliding parts characterized by being below 0.00 ppm.
ングステンおよびその化合物である請求項１記載のセラ
ミック摺動部品。2. The ceramic sliding component according to claim 1, wherein the metal component is iron, chromium, nickel, tungsten and a compound thereof.
ｐｍ以下である請求項１または２記載のセラミック摺動
部品。3. The iron content of the metal component is 200 p
The ceramic sliding component according to claim 1 or 2, which has a pm or less.
求項１ないし３いずれか１項に記載のセラミック摺動部
品。4. The ceramic sliding component according to claim 1, wherein the sliding component is a ball bearing.
ち、これを造粒し、所定形状に成形し、焼結するセラミ
ック摺動部品の製造方法において、セラミック摺動部品
における含有金属成分の含有量が３００ｐｐｍ以下にな
るように除去する工程を設けることを特徴とするセラミ
ック摺動部品の製造方法。5. A method for producing a ceramic sliding part, which comprises forming a raw material ceramic powder into a slurry, granulating the raw material ceramic powder, molding the granulated product into a predetermined shape, and sintering the resulting powder. A method of manufacturing a ceramic sliding component, characterized by comprising a step of removing so as to be 300 ppm or less.
セラミック粉末をスラリー化したのち、磁石が装着され
たスクリーンを用いて該スラリーをろ過する工程である
請求項５記載のセラミック摺動部品の製造方法。6. The ceramic sliding part according to claim 5, wherein the step of removing the contained metal component is a step of slurrying the raw material ceramic powder and then filtering the slurry using a screen equipped with a magnet. Manufacturing method.
セラミック粉末をスラリー化する前に、該原料セラミッ
ク粉末を磁石と接触させる工程である請求項５記載のセ
ラミック摺動部品の製造方法。7. The method for producing a ceramic sliding component according to claim 5, wherein the step of removing the contained metal component is a step of bringing the raw material ceramic powder into contact with a magnet before slurrying the raw material ceramic powder.
スラリーを造粒したのち、該造粒物を磁石と接触させる
工程である請求項５記載のセラミック摺動部品の製造方
法。8. The method for producing a ceramic sliding component according to claim 5, wherein the step of removing the contained metal component is a step of granulating the slurry and then bringing the granulated material into contact with a magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7091891A JPH07330443A (en) | 1995-03-27 | 1995-03-27 | Ceramic sliding part and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7091891A JPH07330443A (en) | 1995-03-27 | 1995-03-27 | Ceramic sliding part and its production |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63268695A Division JPH06658B2 (en) | 1988-10-25 | 1988-10-25 | Ceramic sliding component and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07330443A true JPH07330443A (en) | 1995-12-19 |
Family
ID=14039189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7091891A Pending JPH07330443A (en) | 1995-03-27 | 1995-03-27 | Ceramic sliding part and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07330443A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2532635A1 (en) * | 2011-06-10 | 2012-12-12 | Samsung Electronics Co., Ltd. | A method for manufacturing a ceramic product through vacuum vibration pressing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62207767A (en) * | 1986-03-06 | 1987-09-12 | 工業技術院長 | High temperature high strength silicon nitride ceramics and manufacture |
-
1995
- 1995-03-27 JP JP7091891A patent/JPH07330443A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62207767A (en) * | 1986-03-06 | 1987-09-12 | 工業技術院長 | High temperature high strength silicon nitride ceramics and manufacture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2532635A1 (en) * | 2011-06-10 | 2012-12-12 | Samsung Electronics Co., Ltd. | A method for manufacturing a ceramic product through vacuum vibration pressing |
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