JP6120816B2 - 多孔質マグネシウムフェライトペレットをベースとする抵抗タイプの湿度センサー - Google Patents
多孔質マグネシウムフェライトペレットをベースとする抵抗タイプの湿度センサー Download PDFInfo
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Description
本発明の目的は、湿度センサーの製造方法およびRH%変化により抵抗の大幅な変化をもたらすその湿度センサーを提供することである。
本発明のさらにもう1つの目的は、上記湿度センサーを製造するのに使用する材料の30〜40%の範囲内の多孔度を、ベース抵抗(< 300MΩ)を上昇させることなく維持することである。
本発明のさらにもう1つの目的は、コスト効率的生産を確立することおよび湿気への長時間の暴露においてさえも抵抗応答の安定性を有することである。
本発明の上記目的によれば、本明細書において具現化し且つ広範囲に説明しているように、抵抗タイプの湿度センサーを製造するのに多孔質マグネシウムフェライト(MgFe2O4)ペレットを使用する。上記多孔質MgFe2O4ペレットの多孔度を30〜40%に維持すると共に、抵抗を、10%RHにおいて、200〜300MΩの範囲内に保持する。上記多孔質MgFe2O4ペレットは、加工するのが容易であり、多孔質アルミナ薄膜と異なりコスト効率性であり、そして耐久性である。上記多孔質MgFe2O4ペレットは、1%RH変化において、4〜8MΩ間での有意の抵抗の変化を示す。上記多孔質MgFe2O4ペレットの応答時間は、容量および他の抵抗系の既知の湿度センサーよりも速い。さらに、容量タイプの湿度センサーと比較したとき、複雑な回路を必要としない。さらに、上記多孔質MgFe2O4ペレットは、熱的に、化学的に、機械的に安定である。さらに、上記多孔質MgFe2O4ペレットは、特定の湿度において、簡単な抵抗器によって容易に較正し得る。
本発明の1つの局面によれば、上記多孔質マグネシウムフェライトペレットの孔径は、15nm〜450nmの範囲内である。
本発明の1つの局面によれば、上記多孔質マグネシウムフェライトペレットは、10トンの加圧下で、粉末質量0.1〜0.2gおよび寸法5mm×8mm×1mmを有する。
本発明の1つの局面によれば、上記多孔質マグネシウムフェライトペレットは、相対湿度の1%の変化において、4〜8MΩまでの抵抗の変化を示す。
本発明の1つの局面によれば、上記多孔質マグネシウムフェライトペレットの応答時間および回復時間は、それぞれ、120〜150秒および140〜200秒である。
本発明の1つの局面によれば、上記多孔質マグネシウムフェライトペレットは、相対湿度の1%の変化において、4〜8MΩまでの抵抗の変化を示す。
以下、本発明の本質の理解を促すために、図面に示した実施態様を参照し、特定の用語は、その実施態様を説明するために使用する。とは言え、本発明の範囲をそれによって限定するつもりはなく、例示している装置における変更およびさらなる修正並びに図面において例示しているような本発明の本質のさらなる応用を、本発明が関連する技術における熟練者にとって通常に思い付くように目論むことを理解されたい。
Claims (13)
- 30〜40%の範囲内の多孔度を有する多孔質マグネシウムフェライトペレットを製造する方法であって、
酸化マグネシウムまたは炭酸マグネシウムと、酸化第二鉄との1:1のモル比の均質混合物を得る工程、
前記均質混合物を炉内で予備焼結する工程、
予備焼結混合物を粉砕する工程、
粉砕した混合物をペレット化して中間ペレットを製造する工程、および、
前記中間ペレットを焼結して30〜40%の範囲内の多孔度を有する前記多孔質マグネシウムフェライトペレットを製造する工程を含み、
前記多孔質マグネシウムフェライトペレットが、30-70%RHのほぼ直線状応答範囲で、相対湿度の1%の変化において、4〜8MΩまでの抵抗の変化を示すことを特徴とする、方法。 - 前記多孔質マグネシウムフェライトペレットの粒度が、50nm〜1μmの範囲内である、請求項1記載の方法。
- 前記多孔質マグネシウムフェライトペレットの孔径が、15nm〜450nmの範囲内である、請求項1記載の方法。
- 前記ペレット化が、所定量の前記粉砕混合物を液圧プレスにより加圧する工程を含む、請求項1記載の方法。
- 前記ペレット化工程が、
前記粉砕した混合物の粉末の0.1〜0.2gを秤量する工程、および、
前記粉末に10トンの圧力を加えることによって、寸法5mm×8mm×1mmの長方形を形成する工程を含む、請求項3記載の方法。 - 前記多孔質マグネシウムフェライトペレットが、10%の相対湿度において、250±50MΩの範囲内の抵抗を示す、請求項1記載の方法。
- 前記多孔質マグネシウムフェライトペレットの抵抗値が、湿気への長時間の暴露においてさえも、10%、50%および90%の相対湿度において安定である、請求項1記載の方法。
- 前記多孔質マグネシウムフェライトペレットの、30〜70%RH変化についての応答時間および70〜30%RH変化についての回復時間が、それぞれ、120〜150秒および140〜200秒である、請求項1記載の方法。
- 抵抗タイプの湿度センサーを製造する方法であって、
酸化マグネシウムまたは炭酸マグネシウムと、酸化第二鉄との1:1のモル比の均質混合物を得る工程、
前記均質混合物を炉内で予備焼結する工程、
予備焼結混合物を粉砕する工程、
粉砕した混合物をペレット化して中間ペレットを製造する工程、
前記中間ペレットを焼結して30〜40%の範囲内の多孔度を有する多孔質マグネシウムフェライトペレットを製造する工程、および、
前記多孔質マグネシウムフェライトペレットのうちからのペレットを前記抵抗タイプの湿度センサー用のベース抵抗材料として使用して、前記抵抗タイプの湿度センサーを製造する工程を含み、
前記ペレットが、30-70%RHのほぼ直線状応答範囲で、相対湿度の1%の変化において、4〜8MΩまでの抵抗の変化を示すことを特徴とする、方法。 - 第II族元素添加銀ペーストを前記ペレットの縦方向端部の上に拡散させて、前記縦方向端部の各々に抵抗接点を設ける工程であって、前記拡散工程が、前記第II族元素添加銀ペーストを前記ペレットの縦方向端部上に適用し、その後、前記ペレットを加熱する工程を含み、前記第II族元素が、亜鉛金属である工程、および、
テフロン(登録商標)コーティング導線を前記縦方向端部の各々における前記抵抗接点上にハンダ付けする工程をさらに含む、請求項9記載の方法。 - 前記ペレットが、10%の相対湿度において、250±50MΩの範囲内の抵抗を示す、請求項9記載の方法。
- 抵抗タイプの湿度センサーであって、
湿度に対して感受性の抵抗材料、および、
前記抵抗材料に接続されていて前記抵抗材料の抵抗の変化を測定するための少なくとも2個の電極を備え、
30〜40%の範囲内の多孔度を有する多孔質マグネシウムフェライトペレットを、前記抵抗材料として使用し、
前記多孔質マグネシウムフェライトペレットが、MgFe 2 O 4 であり、
前記多孔質マグネシウムフェライトペレットが、30-70%RHのほぼ直線状応答範囲で、相対湿度の1%の変化において、4〜8MΩまでの抵抗の変化を示すことを特徴とする、抵抗タイプの湿度センサー。 - 前記多孔質マグネシウムフェライトペレットが、10%の相対湿度において、250±50MΩの範囲内の抵抗を示す、請求項12記載の抵抗タイプの湿度センサー。
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US10172392B2 (en) | 2016-11-18 | 2019-01-08 | Rai Strategic Holdings, Inc. | Humidity sensing for an aerosol delivery device |
CN209326840U (zh) | 2018-12-27 | 2019-08-30 | 热敏碟公司 | 压力传感器及压力变送器 |
CN112108156B (zh) * | 2019-06-20 | 2023-05-02 | 天津城建大学 | 一种Ag纳米颗粒修饰的MgFe2O4纳米棒复合薄膜的制备方法 |
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US5219832A (en) * | 1991-06-18 | 1993-06-15 | Dawei Zhou | High-tc superconducting ceramic oxide products and macroscopic and microscopic methods of making the same |
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