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    • 9. 发明申请
    • A METHOD OF PRODUCING A DIFFUSION ALLOYED IRON OR IRON-BASED POWDER, A DIFFUSION ALLOYED POWDER, A COMPOSITION INCLUDING THE DIFFUSION ALLOYED POWDER, AND A COMPACTED AND SINTERED PART PRODUCED FROM THE COMPOSITION
    • 扩散合金铁或铁基粉末的制造方法,扩散合金粉末,包括扩散合金粉末的组合物以及由组合物生产的压制和烧结部件
    • WO2010074634A1
    • 2010-07-01
    • PCT/SE2009/051434
    • 2009-12-16
    • HÖGANÄS AB (PUBL)LARSSON, Mats
    • LARSSON, Mats
    • C22C33/02B22F1/00B22F3/12C22C38/16
    • C22C33/0292B22F1/025B22F2998/10C22C9/06C22C38/16Y10T428/12181B22F1/02B22F3/02B22F3/10
    • The present invention relates to a method of producing a diffusion alloyed powder consisting of an iron or iron-based core powder having particles of an alloying powder containing Cu and Ni bonded to the surface of the core particles, comprising providing a unitary alloying powder capable of forming particles of a Cu and Ni containing alloy, mixing the unitary alloying powder with the core powder, and heating the mixed powders in a non-oxidizing or reducing atmosphere to a temperature of 500–1000 ˚C during a period of 10–120 minutes to convert the alloying powder into a Cu and Ni containing alloy, so as to diffusion bond particles of the Cu and Ni alloy to the surface of the iron or iron-based core powder. The alloying powder may be a Cu and Ni alloy, oxide, carbonate or other suitable compound that on heating will form a Cu and Ni alloy. Preferably, the total content of Cu and Ni is at most 20wt%, the particle size distribution of the Cu and Ni alloying powder is such that D 50 is less than 15 μm, and the ratio Cu/Ni in wt% is between 9/1 and 3/1. The compacted and sintered parts produced from the diffusion alloyed iron-based powder of the invention present a minimum of variation of dimensional change from component to component.
    • 本发明涉及一种制造扩散合金粉末的方法,所述扩散合金粉末由铁或铁基芯粉末组成,所述铁或铁基芯粉末具有与芯颗粒表面结合的含有Cu和Ni的合金粉末的颗粒,所述方法包括提供能够 形成含有Cu和Ni的合金的颗粒,将整体合金粉末与芯粉末混合,并在10-120分钟的时间内将非氧化或还原性气氛中的混合粉末加热至500-1000℃的温度 将合金粉末转化成含有Cu和Ni的合金,以使Cu和Ni合金的扩散粘合颗粒到铁或铁基核心粉末的表面。 合金粉末可以是Cu和Ni合金,氧化物,碳酸盐或其它合适的化合物,其在加热时将形成Cu和Ni合金。 优选地,Cu和Ni的总含量为至多20重量%,Cu和Ni合金粉末的粒度分布为D50小于15μm,Cu / Ni的重量%比为9/1 和3/1。 由本发明的扩散合金化铁基粉末制成的压实和烧结部件具有从部件到部件的尺寸变化的最小变化。