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    • 3. 发明公开
    • Adherently sprayed valve seats
    • Adelsen Gespritzter Ventilsitz
    • EP0843022A1
    • 1998-05-20
    • EP97309098.8
    • 1997-11-12
    • Ford Global Technologies, Inc.
    • Popoola, Oludele OlusegunMcCune, Robert CorblyReatherford, Larry VanCartwright, Eddie Lee
    • C23C4/02B23H9/00
    • C23C4/06B23H9/008C23C4/02C23C24/04F01L3/22F02F1/24F02F1/4214F02F2001/245
    • A method of defining valve seats (30) on valve seat supports of an internal combustion engine head. The method includes steps of; (a) roughening the exposed surface of the valve seat support (17) to a finish of 10-50 µm RA; (b) thermally spraying a stream of composite particles onto the roughened support surface (27), using gaseous propellants with sufficient heat and force to produce a dense adherent composite coating (31) of metal and metal oxide particles and to a thickness no greater than 1-1.5 mm; and (c) finish machining if necessary, the sprayed coating to define the valve seat surface. The composite coated product consists of a metal/metal oxide mixture that possesses one or more of the following characteristics: a surface porosity of 2-5%, a density of 6.5-8 grams/cc, a Vickers hardness of about 280 kg/mm 2 at 450°C, high wear resistance and high corrosion resistance.
    • 一种在内燃机头的阀座支架上限定阀座(30)的方法。 该方法包括以下步骤: (a)使阀座支撑件(17)的暴露表面粗糙至10-50微米RA的光洁度; (b)使用具有足够的热量和力的气体推进剂将复合颗粒物流喷射到粗糙化的支撑表面(27)上,以产生金属和金属氧化物颗粒的致密粘附复合涂层(31),并且厚度不大于 1-1.5毫米; 和(c)必要时进行精加工,喷涂涂层定义阀座表面。 复合涂覆产品由具有以下一个或多个特性的金属/金属氧化物混合物组成:表面孔隙率为2-5%,密度为6.5-8克/立方厘米,维氏硬度为约280千克/毫米 <2>在450℃,耐磨性高,耐腐蚀性高。