Sintered valve guide and manufacturing method thereof
    3.
    发明申请
    Sintered valve guide and manufacturing method thereof 审中-公开
    烧结阀导向及其制造方法

    公开(公告)号:US20060032328A1

    公开(公告)日:2006-02-16

    申请号:US11182638

    申请日:2005-07-14

    IPC分类号: C22C33/02

    摘要: Disclosed is a sintered valve guide guide formed of a sintered alloy consisting essentially of 3.5 to 5% copper, 0.3 to 0.6% tin, 0.04 to 0.15% phosphorus, 1.5 to 2.5% carbon and the balance iron, by mass, and as occasion needs, further containing 0.46 to 1.41% metal oxide, and MnS and/or magnesium silicate. The metallographic structure has: a matrix containing a pearlite phase, a Fe—P—C compound phase and a Cu—Sn alloy phase; pores; and a graphite of 1.2 to 1.7% by mass of the sintered alloy. In the cross section, the ratio of the pearlite phase to the matrix is 90 area % or more, the ratio of the Fe—P—C compound phase is 0.1 to 3 area % of the cross section, the ratio of the Cu—Sn alloy phase to the cross section is 1 to 3% by area, and the ratio of a portion of the Fe—P—C compound phase having a thickness of 15 microns or more is 10 area % or less of the whole Fe—P—C compound phase.

    摘要翻译: 公开了一种由基本上由3.5〜5%的铜,0.3〜0.6%的锡,0.04〜0.15%的磷,1.5〜2.5%的碳和余量的铁组成的烧结合金的烧结的导向引导件,并且根据需要 ,还含有0.46〜1.41%的金属氧化物,MnS和/或硅酸镁。 金相结构具有:含有珠光体相,Fe-P-C化合物相和Cu-Sn合金相的基体; 毛孔 以及烧结合金的1.2〜1.7质量%的石墨。 在截面中,珠光体相与基体的比例为90面积%以上,Fe-PC化合物相的比例为截面的0.1〜3面积%,Cu-Sn合金相的比例 横截面为1〜3面积%,Fe-PC化合物相的厚度为15微米以上的部分的比例为整个Fe-PC化合物相的10面积%以下。