Abstract: [Object] To improve both abrasion resistance and seizure resistance. [Solution] A copper alloy sliding material is configured, which contains 0.5 to 12.0 mass % of Sn, 2.0 to 8.0 mass % of Bi, and 1.0 to 5.0 vol % of an inorganic compound, the balance being Cu and inevitable impurities, wherein the inorganic compound includes a first inorganic compound having an average particle size of 0.5 to 3.0 ?m and a second inorganic compound having an average particle size of 4.0 to 20.0 ?m, and wherein a value obtained by dividing a volume fraction of the first inorganic compound by a volume fraction of the second inorganic compound is 0.1 to 1.0.

Abstract: [Object] To improve both abrasion resistance and seizure resistance. [Solution] A copper alloy sliding material is configured, which contains 0.5 to 12.0 mass % of Sn, 2.0 to 8.0 mass % of Bi, and 1.0 to 5.0 vol % of an inorganic compound, the balance being Cu and inevitable impurities, wherein the inorganic compound includes a first inorganic compound having an average particle size of 0.5 to 3.0 ?m and a second inorganic compound having an average particle size of 4.0 to 20.0 ?m, and wherein a value obtained by dividing a volume fraction of the first inorganic compound by a volume fraction of the second inorganic compound is 0.1 to 1.0.

Abstract: There are provided a copper alloy for a slide bearing and a slide bearing, which can prevent Mn—Si primary crystals from causing seizure. The copper alloy for a slide bearing and a slide bearing according to the present invention contain 25 wt % or more and 48 wt % or less of Zn, 1 wt % or more and 7 wt % or less of Mn, 0.5 wt % or more and 3 wt % or less of Si, and 1 wt % or more and 10 wt % or less of Bi, the balance consisting of inevitable impurities and Cu, wherein there exist, in a sliding surface on which a counter material slides, Bi particles having a circle equivalent diameter larger than the average circle equivalent diameter of Mn—Si primary crystals and Bi particles having a circle equivalent diameter smaller than the average circle equivalent diameter of the Mn—Si primary crystals.

Abstract: There are provided a copper alloy for a bearing and a bearing, which can prevent seizure in Mn-Si primary crystals. The copper alloy for a bearing and the bearing according to the present invention contain 25 wt % or more and 48 wt % or less of Zn, 1 wt % or more and 7 wt % or less of Mn, 0.5 wt % or more and 3 wt % or less of Si, and 1 wt % or more and 10 wt % or less of Bi, the balance consisting of inevitable impurities and Cu, and are characterized in that, in a sliding surface on which a counter material slides, the proportion of triangles having an area of 5000 ?m2 or more and including no Bi particle with a circle equivalent diameter of 10 ?m or more, among triangles having the closest three Mn-Si primary crystals as apices, is 20 % or less.

Abstract: There are provided a copper alloy for a bearing and a bearing in which a Mn—Si compound is prevented from being broken and becoming a foreign matter. The copper alloy for a bearing and the bearing according to the present invention contain 25 wt % or more and 48 wt % or less of Zn, 1 wt % or more and 7 wt % or less of Mn, 0.5 wt % or more and 3 wt % or less of Si and 1 wt % or more and 10 wt % or less of Bi, the balance consisting of inevitable impurities and Cu, and are characterized in that the average width value among Mn—Si primary crystal particles dispersed in a sliding surface on which a counter shaft slides is 3 ?m or more.