SILVER POWDER, METHOD OF PRODUCING SILVER POWDER, AND CONDUCTIVE PASTE

• Main Authors: ABE FUMIYA, KANASUGI MINAMI, TORIGOE TARO, KOBU HIROAKI
• Format: Patent
• Language: English; Japanese
• Published: 16.06.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CASTING; CONDUCTORS; ELECTRICITY; INSULATORS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; TRANSPORTING; WORKING METALLIC POWDER

To provide a silver powder allowed to reduce line resistance and a method of producing the same.SOLUTION: A silver powder includes a flaky particle having a cumulative 50% diameter of 3 μm or greater and a percentage of 10 μm or greater particles of 10% or lower, in a volume-based particle distribution as measured by a laser diffraction-scattering particle distribution measuring instrument and a longer diameter of 6 μm or greater in respect of particle shape as observed by image analysis based on SEM images and an irregular-shaped particle having a longer diameter of smaller than 6 μm. The flaky particle has an average aspect ratio, a ratio of average thickness to average longer diameter, of 8 or greater. The irregular-shaped particle has a shape factor, a ratio of an average particle area thereof to an area of a circle having an average maximum length as a diameter, of 1.7 or greater and 1.9 or smaller and an ignition loss value of 0.1 wt.% or greater and 0.4 wt.% or smaller.SELECTED DRAWING: None 【課題】ライン抵抗を低減可能な銀粉及びその製造方法を提供する。【解決手段】銀粉は、レーザー回折散乱式粒度分布測定装置によって測定した体積基準の粒度分布において、累積５０％径が３μｍ以上、且つ、１０μｍ以上の粒子の比率が１０％以下であり、ＳＥＭ像に基づく画像解析によって観察した粒子形状に関し、長径が６μｍ以上のフレーク状粒子と、長径が６μｍ未満の不定形粒子と、を含み、フレーク状粒子における平均長径と平均厚さとの比である平均アスペクト比は８以上であり、不定形粒子における平均最大長を直径とした円の面積と不定形粒子の平均粒子面積との比である形状係数が１．７以上１．９以下であり、強熱減量値が０．１ｗｔ％以上０．４ｗｔ％である。【選択図】なし