JPH05194016A - Piezoelectric ceramics - Google Patents
Piezoelectric ceramicsInfo
- Publication number
- JPH05194016A JPH05194016A JP925192A JP925192A JPH05194016A JP H05194016 A JPH05194016 A JP H05194016A JP 925192 A JP925192 A JP 925192A JP 925192 A JP925192 A JP 925192A JP H05194016 A JPH05194016 A JP H05194016A
- Authority
- JP
- Japan
- Prior art keywords
- alkali metal
- piezoelectric
- piezoelectric ceramics
- parts
- ceramics
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 28
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 15
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 15
- 238000009413 insulation Methods 0.000 abstract description 9
- 230000006866 deterioration Effects 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 abstract description 5
- 230000035939 shock Effects 0.000 abstract description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 abstract description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 150000001339 alkali metal compounds Chemical class 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 abstract description 2
- 235000011187 glycerol Nutrition 0.000 abstract description 2
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 abstract description 2
- 229920000609 methyl cellulose Polymers 0.000 abstract description 2
- 239000001923 methylcellulose Substances 0.000 abstract description 2
- 235000010981 methylcellulose Nutrition 0.000 abstract description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 2
- 235000017550 sodium carbonate Nutrition 0.000 abstract 1
- 239000011734 sodium Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910001413 alkali metal ion Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は圧電セラミックスにかか
り、詳しくは、その圧電特性の劣化を抑制するための技
術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to piezoelectric ceramics, and more particularly to a technique for suppressing the deterioration of its piezoelectric characteristics.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】従来か
ら、圧電セラミックスが圧電性とともに焦電性を有して
おり、分極処理された圧電セラミックスに対して熱衝撃
が加わった場合には焦電効果に伴う電荷が発生すること
は一般的に知られた事実である。そして、圧電セラミッ
クスにおいては、これの有する絶縁抵抗が大きいため、
発生した電荷が容易には解消されずに電界を生じること
となり、自発分極の向きに影響を与えることになる結
果、圧電特性の劣化が引き起こされてしまうことになっ
ていた。2. Description of the Related Art Conventionally, piezoelectric ceramics have a piezoelectric property as well as a pyroelectric property, and when a piezoelectric ceramic subjected to a polarization treatment is subjected to thermal shock, it is pyroelectrically charged. It is a generally known fact that an electric charge is generated due to the effect. In piezoelectric ceramics, since it has a large insulation resistance,
The generated charges are not easily eliminated and an electric field is generated, which affects the direction of spontaneous polarization, resulting in deterioration of piezoelectric characteristics.
【０００３】本発明は、このような不都合に鑑みて創案
されたものであって、絶縁抵抗を低下させることによっ
て圧電特性の劣化を抑制することができる圧電セラミッ
クスの提供を目的としている。The present invention was devised in view of such inconveniences, and an object thereof is to provide a piezoelectric ceramics capable of suppressing the deterioration of piezoelectric characteristics by lowering the insulation resistance.
【０００４】[0004]
【課題を解決するための手段】本発明にかかる圧電セラ
ミックスは、このような目的を達成するために、１００
ないし１０００ｐｐｍのアルカリ金属を含有してなるこ
とを特徴とするものである。In order to achieve such an object, the piezoelectric ceramics according to the present invention is 100%
To 1000 ppm of alkali metal.
【０００５】[0005]
【作用】上記構成によれば、Ｎａ+やＫ+などのアルカリ
金属イオンを含有することによって圧電セラミックスの
有する絶縁抵抗は低下することになり、この圧電セラミ
ックスに対して熱衝撃が加わることによって発生した電
荷は速やかに解消されてしまうことになる。According to the above structure, the insulation resistance of the piezoelectric ceramic is lowered by containing the alkali metal ions such as Na + and K +, which is caused by the thermal shock applied to the piezoelectric ceramic. The generated charge will be promptly eliminated.
【０００６】[0006]
【実施例】以下、本発明の実施例を説明する。なお、本
発明の要旨は、圧電セラミックスが１００ないし１００
０ｐｐｍのアルカリ金属を含有していることを特徴とす
るものである。EXAMPLES Examples of the present invention will be described below. The gist of the present invention is that the piezoelectric ceramic is 100 to 100.
It is characterized by containing 0 ppm of an alkali metal.
【０００７】具体的には、まず、原料であるチタン酸ジ
ルコン酸鉛系の圧電セラミックス粉末１００部に対して
メチルセルロースバインダ４部、グリセリン２部、純水
１２部をそれぞれ加えた後、３本ロール混練機などを用
いることによって十分に混練りする。そして、このと
き、加えられる純水には、アルカリ金属の化合物である
炭酸ナトリウム（Ｎａ2ＣＯ3）あるいは炭酸カリウム
（Ｋ2ＣＯ3）を予め所定の比率、例えば、Ｎａもしくは
Ｋが１００ｐｐｍや５００ｐｐｍまたは１０００ｐｐｍ
の比率となるように溶解しておく。なお、ここで、アル
カリ金属の含有量を１００ないし１０００ｐｐｍの範囲
内としたのは、含有量が１００ｐｐｍ以下であれば絶縁
抵抗の低下が不十分となって圧電特性の劣化が生じるこ
とになる一方、アルカリ金属の含有量が１０００ｐｐｍ
以上であれば圧電セラミックスにおける粒子密度の低下
や圧電特性の劣化が生じるためである。Specifically, first, 4 parts of methyl cellulose binder, 2 parts of glycerin, and 12 parts of pure water are added to 100 parts of the lead zirconate titanate-based piezoelectric ceramic powder as a raw material, and then three rolls are added. Knead thoroughly by using a kneader or the like. Then, at this time, the pure water added contains sodium carbonate (Na 2 CO 3 ) or potassium carbonate (K 2 CO 3 ) which is an alkali metal compound in a predetermined ratio, for example, 100 ppm or 500 ppm of Na or K. Or 1000ppm
Dissolve so that the ratio becomes. Here, the content of the alkali metal is set within the range of 100 to 1000 ppm because if the content is 100 ppm or less, the insulation resistance is not sufficiently reduced and the piezoelectric characteristics are deteriorated. , The content of alkali metal is 1000ppm
This is because if it is above, the particle density of the piezoelectric ceramic is lowered and the piezoelectric characteristics are deteriorated.
【０００８】次に、このようにして得られた混練物を真
空押出成形機によって厚み４５０μｍのグリーン（生）
シートとして成形し、さらに、例えば、２４×３６ｍｍ
の金型を用いて角板状に打ち抜いた後、アルミナなどか
らなる焼成用匣鉢（図示していない）内に収納したう
え、１２５０℃の温度下で２時間にわたって焼成する。
すると、厚み４００μｍ、外寸法２０×３０ｍｍ程度の
角板状となった圧電セラミックスが得られることにな
り、この圧電セラミックスの粒界にはＮａ+やＫ+などの
アルカリ金属イオンが析出していることになる。さら
に、この圧電セラミックスを厚み２００μｍ程度となる
までラッピング処理し、その両主面それぞれに銀電極を
真空蒸着によって形成した後、銀電極間に６００Ｖの直
流電界を加えることによって分極処理する。Next, the kneaded product thus obtained was subjected to a vacuum extrusion molding machine to obtain a green (raw) having a thickness of 450 μm.
Molded as a sheet, and further, for example, 24 x 36 mm
After punching into a square plate shape using the mold of (1), it is housed in a baking bowl (not shown) made of alumina or the like, and baked at a temperature of 1250 ° C. for 2 hours.
Then, a piezoelectric ceramic in the form of a rectangular plate having a thickness of 400 μm and an outer dimension of about 20 × 30 mm is obtained, and alkali metal ions such as Na + and K + are precipitated at the grain boundaries of this piezoelectric ceramic. It will be. Further, the piezoelectric ceramics are lapped to a thickness of about 200 μm, and silver electrodes are formed on each of both main surfaces by vacuum vapor deposition, and then a polarization electric field is applied by applying a DC electric field of 600 V between the silver electrodes.
【０００９】その後、本発明の発明者らがアルカリ金属
を含有することによる効果を確認すべく、Ｋ2ＣＯ3を添
加してなる試料Ａと、Ｎａ2ＣＯ3を添加してなる試料Ｂ
とを用意したうえで試料Ａ，Ｂそれぞれの有する絶縁抵
抗ＩＲを測定したところ、図１で示すような測定結果が
得られた。そして、この図１によれば、アルカリ金属を
含有しない従来例通りの圧電セラミックス、すなわち、
横軸で表されたアルカリ金属の含有量が０ｐｐｍである
試料に比べ、５００ｐｐｍのＫを含有してなる試料Ａで
はＩＲが約３０％低下することとなり、５００ｐｐｍの
Ｎａを含有してなる試料Ｂでは約６０％も低下している
ことが分かる。Then, in order to confirm the effect of the inclusion of an alkali metal by the inventors of the present invention, a sample A containing K 2 CO 3 and a sample B containing Na 2 CO 3 were added.
When the insulation resistance IR of each of the samples A and B was measured after preparing and, the measurement results shown in FIG. 1 were obtained. And according to this FIG. 1, the piezoelectric ceramics as in the conventional example containing no alkali metal, that is,
Compared with the sample in which the content of alkali metal represented by the horizontal axis is 0 ppm, the IR of the sample A containing 500 ppm of K is reduced by about 30%, and the sample B containing 500 ppm of Na is shown. Then, it can be seen that it is reduced by about 60%.
【００１０】また、−５５℃及び＋８５℃の温度間にお
ける１００サイクルの熱衝撃試験（電極開放）を行って
みたところ、図２で示すように、圧電特性の一つである
電気機械結合定数Ｋａの変化率がＫを含有してなる試料
Ａでは従来例通りの試料に比べて約２５％、Ｎａを含有
してなる試料Ｂでは約１５％低下する一方、図３で示す
ように、容量Ｃの変化率が試料Ａでは従来例通りの試料
に比べて約４５％、試料Ｂでは約１０％低下することも
明らかとなった。Further, when a 100-cycle thermal shock test (opening of electrodes) between temperatures of −55 ° C. and + 85 ° C. was conducted, as shown in FIG. 2, an electromechanical coupling constant Ka, which is one of the piezoelectric characteristics, was obtained. The rate of change of sample A containing K is about 25% lower than that of the sample as in the conventional example, and that of sample B containing Na is about 15% lower. It was also clarified that the sample A has a change rate of about 45% and the sample B has a decrease rate of about 10% as compared with the sample as in the conventional example.
【００１１】[0011]
【発明の効果】以上説明したように、本発明によれば、
１００ないし１０００ｐｐｍのアルカリ金属を含有する
ことによって圧電セラミックスの有する絶縁抵抗は低下
することになり、この圧電セラミックスに対して熱衝撃
が加わることによって発生した電荷は電界を生じること
なく速やかに解消されてしまう。そのため、圧電特性の
劣化を抑制することができるという効果が得られること
になる。As described above, according to the present invention,
By containing 100 to 1000 ppm of the alkali metal, the insulation resistance of the piezoelectric ceramic is lowered, and the electric charge generated by the thermal shock applied to the piezoelectric ceramic is quickly eliminated without generating an electric field. End up. Therefore, the effect that the deterioration of the piezoelectric characteristics can be suppressed can be obtained.
【図１】圧電セラミックスの有する絶縁抵抗とアルカリ
金属の含有量との相関関係を示す線図である。FIG. 1 is a diagram showing the correlation between the insulation resistance of piezoelectric ceramics and the content of alkali metals.
【図２】圧電セラミックスの有する電気機械結合定数の
変化率とアルカリ金属の含有量との相関関係を示す線図
である。FIG. 2 is a diagram showing a correlation between a rate of change of an electromechanical coupling constant of piezoelectric ceramics and an alkali metal content.
【図３】圧電セラミックスの有する容量の変化率とアル
カリ金属の含有量との相関関係を示す線図である。FIG. 3 is a diagram showing a correlation between a rate of change in capacity of piezoelectric ceramics and an alkali metal content.
Claims (1)
金属を含有してなることを特徴とする圧電セラミック
ス。1. A piezoelectric ceramic containing 100 to 1000 ppm of an alkali metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP925192A JP2934692B2 (en) | 1992-01-22 | 1992-01-22 | Manufacturing method of piezoelectric ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP925192A JP2934692B2 (en) | 1992-01-22 | 1992-01-22 | Manufacturing method of piezoelectric ceramics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05194016A true JPH05194016A (en) | 1993-08-03 |
| JP2934692B2 JP2934692B2 (en) | 1999-08-16 |
Family
ID=11715196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP925192A Expired - Fee Related JP2934692B2 (en) | 1992-01-22 | 1992-01-22 | Manufacturing method of piezoelectric ceramics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2934692B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031887A1 (en) * | 2003-09-25 | 2005-04-07 | Kyocera Corporation | Multilayer piezoelectric device |
| JP2005101274A (en) * | 2003-09-25 | 2005-04-14 | Kyocera Corp | Piezoelectric ceramics, and lamination piezoelectric element and fuel injection system using the same |
| JP2005183553A (en) * | 2003-12-17 | 2005-07-07 | Kyocera Corp | Laminated piezoelectric element and injection system |
| JP2011082534A (en) * | 2010-11-09 | 2011-04-21 | Kyocera Corp | Laminated piezoelectric element and injection device using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50119998A (en) * | 1974-03-12 | 1975-09-19 | ||
| JPS543298A (en) * | 1977-06-08 | 1979-01-11 | Matsushita Electric Ind Co Ltd | Manufacturing process for piezoelectric ceramics |
| JPS6212654A (en) * | 1985-07-09 | 1987-01-21 | 永田 邦裕 | Piezoelectric ceramics |
| JPS6336584A (en) * | 1986-07-30 | 1988-02-17 | Japan Storage Battery Co Ltd | Piezoelectric material |
-
1992
- 1992-01-22 JP JP925192A patent/JP2934692B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50119998A (en) * | 1974-03-12 | 1975-09-19 | ||
| JPS543298A (en) * | 1977-06-08 | 1979-01-11 | Matsushita Electric Ind Co Ltd | Manufacturing process for piezoelectric ceramics |
| JPS6212654A (en) * | 1985-07-09 | 1987-01-21 | 永田 邦裕 | Piezoelectric ceramics |
| JPS6336584A (en) * | 1986-07-30 | 1988-02-17 | Japan Storage Battery Co Ltd | Piezoelectric material |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031887A1 (en) * | 2003-09-25 | 2005-04-07 | Kyocera Corporation | Multilayer piezoelectric device |
| JP2005101274A (en) * | 2003-09-25 | 2005-04-14 | Kyocera Corp | Piezoelectric ceramics, and lamination piezoelectric element and fuel injection system using the same |
| US7679272B2 (en) | 2003-09-25 | 2010-03-16 | Kyocera Corporation | Multi-layer piezoelectric element |
| US7759847B2 (en) | 2003-09-25 | 2010-07-20 | Kyocera Corporation | Multi-layer piezoelectric device |
| US7902726B2 (en) | 2003-09-25 | 2011-03-08 | Kyocera Corporation | Multi-layer piezoelectric device |
| JP2005183553A (en) * | 2003-12-17 | 2005-07-07 | Kyocera Corp | Laminated piezoelectric element and injection system |
| JP4593909B2 (en) * | 2003-12-17 | 2010-12-08 | 京セラ株式会社 | Multilayer piezoelectric element and injection device |
| JP2011082534A (en) * | 2010-11-09 | 2011-04-21 | Kyocera Corp | Laminated piezoelectric element and injection device using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2934692B2 (en) | 1999-08-16 |
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