采用离心铸造在金属型中生产P·O55C5(一种含5％Sn、55％Zn和5％Pb的青铜——译者)轴承套(内径115—140mm,厚15—25mm,长500mm)时,常产生喇叭状气孔缺陷。这是因为在浇注时,铜合金与铸型界面上的气体在临界压力下进入尚未凝固的铜合金中所致。 为了防止产生这种缺陷,在金属型表面试验涂刷各种不同的涂料。但试验了多种涂料(包括石墨、焦炭粉、锆英粉和滑石粉等)都没有获得满意的结果。只有使用特殊的松散填料,在金属型与凝 Centrifugal casting was used to produce P · O55C5 (a bronze translator with 5% Sn, 55% Zn and 5% Pb) bearing sleeves (inner diameter 115-140 mm, thickness 15-25 mm, length 500 mm) in a metal mold , Often produce horn-like stomatal defects. This is due to the fact that the gas at the interface between the copper alloy and the mold at the time of casting is caused to enter the copper alloy which has not solidified under the critical pressure. In order to prevent such defects from occurring, a variety of coatings are applied to the metal surface test. However, many coatings tested (including graphite, coke powder, zircon powder and talcum powder, etc.) did not achieve satisfactory results. Only use special loose packing, in the metal type and condensate