发明申请
- 专利标题: Sintered valve guide and manufacturing method thereof
- 专利标题(中): 烧结阀导向及其制造方法
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申请号: US11182638申请日: 2005-07-14
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公开(公告)号: US20060032328A1公开(公告)日: 2006-02-16
- 发明人: Katsunao Chikahata , Koichiro Hayashi , Hiroki Fujitsuka , Toru Tsuboi
- 申请人: Katsunao Chikahata , Koichiro Hayashi , Hiroki Fujitsuka , Toru Tsuboi
- 优先权: JPP2004-209064 20040715
- 主分类号: C22C33/02
- 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.
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