Method for producing lead ruthenate fine powder, and lead ruthenate hydroxide and hydrate for producing lead ruthenate fine powder.

JP7871634B2Active Publication Date: 2026-06-09SUMITOMO METAL MINING CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SUMITOMO METAL MINING CO LTD
Filing Date
2022-06-30
Publication Date
2026-06-09

AI Technical Summary

Benefits of technology

【0019】 本発明によれば、製造条件の僅かな変動による影響をほとんど受けることなく、粗大粒子を含まず、かつ、厚膜チップ抵抗器等の電子部品に悪影響を及ぼす硫黄を含有しない微細なルテニウム酸鉛粉末を製造することができる。また、本発明のルテニウム酸鉛微粉末を導電粉に用いた厚膜抵抗ペーストにより作製された厚膜抵抗体は、その厚みを極めて薄くすることができる。小型化の進む電子部品の抵抗体に用いる導電粉末材料として、本発明のルテニウム酸鉛微粉末の工業的価値は極めて大きい。

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Abstract

To provide a method of producing lead ruthenate fine powder, capable of producing lead ruthenate fine powder without allowing inclusion of sulfur adversely influencing an electronic component and without containing coarse particles, as lead ruthenate powder to be used in a resistor constituting an electronic component such as a thick film chip resistor, and a hydroxide and a hydrate of lead ruthenate for producing lead ruthenate fine powder.SOLUTION: The method of producing lead ruthenate fine powder, comprises a step of allowing calcium to stick to a hydroxide or a hydrate of lead ruthenate and subsequently roasting the same.SELECTED DRAWING: None
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Claims

1. A method for producing fine lead ruthenate powder, characterized by attaching calcium to the surface of lead ruthenate hydroxide or hydrate at a concentration of 2,000 ppm by mass or more and 4,000 ppm by mass or less, and then roasting it.

2. A method for producing lead ruthenate fine powder according to claim 1, characterized in that an aqueous solution of a calcium-containing compound is added to lead ruthenate hydroxide or hydrate free of impurities, and the mixture is stirred and filtered to deposit calcium on the surface of the lead ruthenate hydroxide or hydrate to a concentration of 2000 ppm by mass or more and 4000 ppm by mass or less.

3. A method for producing lead ruthenate fine powder according to claim 1 or 2, characterized by washing the roasted lead ruthenate fine powder to remove calcium adhering to the surface and then drying it.

4. A lead ruthenate hydroxide for producing lead ruthenate fine powder, characterized in that calcium is attached to the surface of the lead ruthenate hydroxide at a concentration of 2000 ppm by mass or more and 4000 ppm by mass or less.

5. A lead ruthenate hydrate for producing lead ruthenate fine powder, characterized in that calcium is attached to the surface of the lead ruthenate hydrate at a concentration of 2000 ppm by mass or more and 4000 ppm by mass or less.