JPH0546961B2 - - Google Patents
Info
- Publication number
- JPH0546961B2 JPH0546961B2 JP8716636A JP1663687A JPH0546961B2 JP H0546961 B2 JPH0546961 B2 JP H0546961B2 JP 8716636 A JP8716636 A JP 8716636A JP 1663687 A JP1663687 A JP 1663687A JP H0546961 B2 JPH0546961 B2 JP H0546961B2
- Authority
- JP
- Japan
- Prior art keywords
- sample number
- moisture
- ceramic composition
- humidity
- sensitive ceramic
- 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
Links
- 239000000919 ceramic Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 229910052768 actinide Inorganic materials 0.000 claims description 3
- 150000001255 actinides Chemical class 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- VQCBHWLJZDBHOS-UHFFFAOYSA-N erbium(III) oxide Inorganic materials O=[Er]O[Er]=O VQCBHWLJZDBHOS-UHFFFAOYSA-N 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium oxide Inorganic materials [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 description 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Non-Adjustable Resistors (AREA)
Description
（産業上の利用分野）
この発明は、感湿セラミツク組成物に関し、特
に、電子レンジ、オーブン、食器乾燥機などの食
品調理器をはじめ各種機器の湿度センサとして広
く用いることができる感湿セラミツク組成物に関
する。
（従来の技術）
従来、このような用途に用いられる感湿セラミ
ツクとしては、MgCr2O4−TiO2、ZnO−Cr2O3
Li2Ｏ、V2O5−TiO2などがあり、これらの多くは
湿度センサの材料として使用されている。たとえ
ば、特公昭56−6121号公報には、加熱クリーニン
グが容易にでき、かつ安定な特性を示す感湿セラ
ミツクが開示されている。
（発明が解決しようとする問題点）
しかしながら、これら従来の感湿セラミツク
は、150℃以上の高温域において感湿特性が低下
したり、また、低下しなくてもその特性が要求を
満足できなかつたりするため、たとえば、高温域
で絶対温度を検知することが要求される電子レン
ジなどでは、その要求を満たすことができなかつ
た。
したがつて、この発明は、室温から高温域まで
感度の良好な感湿セラミツク組成物を提供するも
のである。
（問題点を解決するための手段）
この発明は、次の一般式、
AB1-xB′xO3（０＜Ｘ≦0.30）からなる感湿セラ
ミツク組成物である。
ただし、ＡはCa，Sr，Baのうち少なくとも１
種
ＢはCe，Zrのうち少なくとも１種
B′はアクチナイドを除くａ族およびInのうち
少なくとも１種
この発明の感湿セラミツク組成物は、上記した
組成を構成する各種材料を調合し、調合原料を混
合して仮焼し、この仮焼粉末にバインダを加えた
のち成形し、さらに成形体を焼成することにより
得られる。そして、得られた焼結体の表面にポー
ラスな電極を付与することにより湿度センサが得
られることになる。
（発明の効果）
この発明の感湿セラミツク組成物によれば、信
頼性が高く、しかも150℃以上の高温域でも、絶
対湿度の検知ができる湿度センサを提供すること
ができ、また検湿感度の経時変化が小さく、さら
には高湿側から低湿側への応答が速いという効果
を有する。
（実施例）
以下に、この発明にかかる感湿セラミツク組成
物について詳細に説明する。
原料として、主成分となるCaCO3、SrCO3、
BaCO3、CeO2、La2O3、Nd2O3、Y2O3、Er2O3、
DyO3、Pr2O3、Sm2O3、Sc2O3およびIn2O3を用
意し、これらを第１表に示す組成になるように秤
量した。これらの秤量物をボールミルで湿式混合
した。次に、これを脱水、乾燥し、1100℃〜1250
℃で２時間仮焼した。
そして、この仮焼物を粉砕し、酢酸ビニル系樹
脂を10重量％加えて混合し、得られた造粒粉末を
約2ton.cm2の圧力で直径10mm、厚み0.5mmの円板に
成形した。この成形円板を空気中で1350℃の温度
で２時間焼成した。得られた直径8.00mm、厚み
0.45mmの焼結体の両表面に直径7.00mmの白金のポ
ーラス電極を付与して湿度センサとした。
このようにして得た湿度センサを用いて、水蒸
気を104ppmw（重量比表示）含む450℃の雰囲気
中の抵抗値（PH1）、および水蒸気を105ppmw含
む450℃の雰囲気中の抵抗値（RH2）を、それぞ
れ測定した。さらに、これらの値を次式に代入し
て、湿度感度ｓを算出した。
RH1＝RH2・（H1／H2）-s
H1：104ppmw、H2：105ppmw
このようにして、第１表に示したような結果を
得た。
なお、第１表中＊印を付した試料はこの発明範
囲外のものであり、それ以外はこの発明範囲内の
ものである。
(Industrial Application Field) The present invention relates to a moisture-sensitive ceramic composition, and more particularly to a moisture-sensitive ceramic composition that can be widely used as a humidity sensor for various appliances including food cookers such as microwave ovens, ovens, and dish dryers. relating to things. (Prior art) Conventionally, moisture-sensitive ceramics used for such applications include MgCr 2 O 4 −TiO 2 and ZnO−Cr 2 O 3
Examples include Li 2 O and V 2 O 5 -TiO 2 , and many of these are used as materials for humidity sensors. For example, Japanese Patent Publication No. 56-6121 discloses a moisture-sensitive ceramic that can be easily heated and cleaned and exhibits stable characteristics. (Problems to be Solved by the Invention) However, with these conventional moisture-sensitive ceramics, the moisture-sensing properties may deteriorate in a high temperature range of 150°C or higher, or even if the moisture-sensing properties do not deteriorate, the properties may not satisfy the requirements. Therefore, for example, in a microwave oven, etc., which is required to detect absolute temperature in a high-temperature range, this requirement cannot be met. Therefore, the present invention provides a moisture-sensitive ceramic composition having good sensitivity from room temperature to high temperature. (Means for Solving the Problems) The present invention is a moisture-sensitive ceramic composition having the following general formula: AB 1-x B' x O 3 (0<X≦0.30). However, A is at least one of Ca, Sr, and Ba.
Species B is at least one of Ce and Zr B' is at least one of Group A excluding actinide and In The moisture-sensitive ceramic composition of the present invention is produced by blending various materials constituting the above-mentioned composition, It is obtained by mixing and calcining the powder, adding a binder to the calcined powder, molding it, and then firing the molded body. A humidity sensor is then obtained by providing a porous electrode on the surface of the obtained sintered body. (Effects of the Invention) According to the humidity-sensitive ceramic composition of the present invention, it is possible to provide a humidity sensor that is highly reliable and can detect absolute humidity even in a high temperature range of 150°C or higher, and also has humidity detection sensitivity. It has the effect that the change over time is small, and the response from the high humidity side to the low humidity side is fast. (Example) The moisture-sensitive ceramic composition according to the present invention will be explained in detail below. As raw materials, the main components are CaCO 3 , SrCO 3 ,
BaCO3 , CeO2 , La2O3 , Nd2O3 , Y2O3 , Er2O3 ,
DyO 3 , Pr 2 O 3 , Sm 2 O 3 , Sc 2 O 3 and In 2 O 3 were prepared and weighed to give the compositions shown in Table 1. These weighed materials were wet mixed in a ball mill. Next, dehydrate and dry this at 1100℃~1250℃.
It was calcined at ℃ for 2 hours. Then, this calcined product was pulverized, 10% by weight of vinyl acetate resin was added and mixed, and the resulting granulated powder was molded into a disk with a diameter of 10 mm and a thickness of 0.5 mm under a pressure of about 2 ton.cm 2 . This shaped disk was fired in air at a temperature of 1350° C. for 2 hours. Obtained diameter 8.00mm, thickness
Platinum porous electrodes with a diameter of 7.00 mm were attached to both surfaces of a 0.45 mm sintered body to make a humidity sensor. Using the humidity sensor obtained in this way, we measured the resistance value (PH 1 ) in an atmosphere at 450°C containing 10 4 ppmw of water vapor (expressed as a weight ratio) and the resistance in an atmosphere at 450°C containing 10 5 ppmw of water vapor. The values (RH 2 ) were measured in each case. Furthermore, the humidity sensitivity s was calculated by substituting these values into the following equation. RH 1 =RH 2 ·(H 1 /H 2 ) -s H 1 : 10 4 ppmw, H 2 : 10 5 ppmw In this way, the results shown in Table 1 were obtained. Note that the samples marked with * in Table 1 are outside the scope of this invention, and the others are within the scope of this invention.
【表】【table】
【表】【table】
【表】【table】
【表】
第１表から明らかなように、この発明の感湿セ
ラミツク組成物について、ｘの範囲を０＜Ｘ≦
0.30としたのは以下の理由による。つまり、ｘが
０では湿度感度が低下するからである。（試料番
号１、試料番号３、試料番号８、試料番号23、試
料番号42、試料番号61、試料番号80）。また、ｘ
が0.30を越えた場合にも感湿感度が低下する（試
料番号７、試料番号12、試料番号16、試料番号
27、試料番号31、試料番号35、試料番号46、試料
番号50、試料番号54、試料番号65、試料番号69、
試料番号73、試料番号84、試料番号88、試料番号
92）。
なお、この発明の感湿セラミツク組成物は、第
１表以外のアクチノイドを除くａ族の元素、た
とえば、Pm、Eu、Gd、Tb、Ho、Tm、Yb、
Luを用いてもよい。
また、製法については、シート成形方式や、ペ
ーストによる厚膜方式など、上記した実施例の方
法とは異なる他の方法を用いてもよい。[Table] As is clear from Table 1, for the moisture-sensitive ceramic composition of the present invention, the range of x is 0<X≦
The reason for setting it to 0.30 is as follows. In other words, when x is 0, the humidity sensitivity decreases. (Sample number 1, sample number 3, sample number 8, sample number 23, sample number 42, sample number 61, sample number 80). Also, x
The moisture sensitivity also decreases when the value exceeds 0.30 (Sample No. 7, Sample No. 12, Sample No.
27, sample number 31, sample number 35, sample number 46, sample number 50, sample number 54, sample number 65, sample number 69,
Sample number 73, sample number 84, sample number 88, sample number
92). The moisture-sensitive ceramic composition of the present invention contains elements of Group A excluding actinides other than those in Table 1, such as Pm, Eu, Gd, Tb, Ho, Tm, Yb,
Lu may also be used. Further, as for the manufacturing method, other methods different from those of the above-described embodiments may be used, such as a sheet molding method or a thick film method using paste.
Claims (1)
徴とする感湿セラミツク組成物。 ただし、ＡはCa，Sr，Baのうち少なくとも１
種 ＢはCe，Zrのうち少なくとも１種 B′はアクチナイドを除くａ族およびInのうち
少なくとも１種[Scope of Claims] 1. A moisture-sensitive ceramic composition characterized by having the following general formula: AB 1-x B' x O 3 (0<X≦0.30). However, A is at least one of Ca, Sr, and Ba.
Species B is at least one of Ce and Zr B' is at least one of group a and In excluding actinides
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61-19064 | 1986-01-29 | ||
| JP61-19065 | 1986-01-29 | ||
| JP1906486 | 1986-01-29 | ||
| JP61-20555 | 1986-01-31 | ||
| JP61-20556 | 1986-01-31 | ||
| JP61-87507 | 1986-04-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6344702A JPS6344702A (en) | 1988-02-25 |
| JPH0546961B2 true JPH0546961B2 (en) | 1993-07-15 |
Family
ID=11989001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62016636A Granted JPS6344702A (en) | 1986-01-29 | 1987-01-27 | Moisture-sensitive ceramic compound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6344702A (en) |
-
1987
- 1987-01-27 JP JP62016636A patent/JPS6344702A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6344702A (en) | 1988-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |