摘要:
The mixed powder for iron-based powder metallurgy of the present invention comprises a powder containing calcium sulfate anhydrite II such that the CaS weight ratio after sintering is 0.01 wt% or more to 0.1 wt% or less. The powder containing calcium sulfate anhydrite II preferably has a volume-average particle size of 0.1 µm or more to 60 µm or less and preferably additionally contains one or more ternary oxides selected from the group consisting of Ca-Al-Si oxides and Ca-Mg-Si oxides. The weight ratio of the ternary oxides and CaS after the sintering is preferably 3 : 7 to 9 : 1.
摘要:
A powder metal blend for making a powder metal part especially a valve guide 14 for an internal combustion engine particularly suited for operation where there is little or no engine oil lubricant at the valve stem 30 and valve guide 14 interface. The powder metal blend having a chemical composition on a weight percent basis of about 2 to about 10 percent copper; about 0.5 to about 5.0 percent solid lubricant; about 1.0 to about 3.0 percent graphite; about 1.0 to about 8.0 percent bronze; about 0.2 to about 1.5 percent copper and/or iron phosphorus; about 0.3 to about 1.0 percent fugitive lubricant; and the balance being a low alloy steel powder containing about 0.3 to about 1.0 percent manganese.
摘要:
An iron based powder mixture for powder metallurgy is provided which can produce a sintered material having by far higher machinability and sliding properties than conventional sintered materials, and also a sintered material containing alloy elements but having adaptability to sizing even after sintering; it comprises an atomized iron powder comprising S in a content of 0.03 to 0.30 wt%, Mn in a content of 0.05 to 0.40 wt% and the balance Fe and incidental impurities, to which is added one or more than one B-containing compound powder selected from boron nitride (BN), boric acid (H 3 BO 3 ), boron oxide (B 2 O 3 ) and the like in an amount of 0.001 to 0.3 wt% expressed as B, and incorporated with an MnS powder in an amount of 0.05 to 1.0 wt%, optionally alloyed partially with or prealloyed with Ni, Mo and Cu.
摘要:
Die Erfindung bezieht sich auf eine Eisenbasislegierung mit zumindest Mangan, Kohlenstoff und Schwefel als Legierungszusätze, insbesondere mit guten Gebrauchseigenschaften bei der Kunststoffverarbeitung sowie ein Verfahren und eine Vorrichtung zu deren Herstellung. Erfindungsgemäß ist vorgesehen, daß die Gegenstände in ihrer Urform aus kompaktiertem Material bestehen bzw. durch Sprühen des flüssigen Metalles oder pulvermetallurgisch hergestellt werden, wobei bei der Herstellung dem Werkstoff eine einen Durchschnittsgehalt von in Gew.-% 0̸,0̸5 bis 0̸,3 Schwefel bewirkende Menge an Schwefel oder Schwefelverbindung(en) zugegeben und reagieren gelassen wird und das kompaktierte Material bzw. die Körper in ihrer Urform durch HIPen und/oder Warmumformen weiterverarbeitet sind bzw. werden.
摘要:
The machinability of a sintered body produced by sintering from a pressed iron powder mixture can be increased substantially by utilising an iron powder mixture in which manganese sulphide is included in the form of a very fine powder having a particle size of less than 10 µm. The iron powder mixture is prepared by adding the manganese sulphide in the form of the said fine powder having a particle size of less than 10 µm and in an amount such that the finished mixture will contain 0.05-5% by weight of manganese sulphide, preferably 0.3-1.0% by weight of manganese sulphide.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von Ventilsitzringen auf pulvermetallurgischem Wege, bei dem ein Pulvergemisch, das 0,8 bis 1,5 Gew.-% Graphit, 1,0 bis 4 Gew.-% Blei, 0,5 bis 5 Gew.-% Nickel, 1,2 bis 1,8 Gew.-% Molybdän, 9,6 bis 14,4 Gew.-% Kobalt, Rest Eisen bei einer Preßkraft zwischen 40 bis 60, vorzugsweise 50 KN/cm 2 zu Ventilsitzringen gepreßt, die Ringe anschließend bei einer Temperatur von 1100 bis 1200°C in neutraler Atmosphäre gesintert und bei einer über 120 KN/cm 2 liegenden Preßkraft nachverdichtet und gegebenenfalls vergütet werden. Erfindungsgemäß wird dem Pulvergemisch Molybdändisulfid (MoS 2 ) in einer Menge von 0,5 bis 1,5 Gew.-% zugesetzt.
摘要:
The present invention relates to a new pre-alloyed metal based powder, intended to be used in surface coating of metal parts. The powder is deposited using e.g. laser cladding or plasma transfer arc welding (PTA), or thermal spray (e.g. HVOF). The powder is useful for reducing friction and improving wear reducing properties of the deposited coating. Such coatings may also improve machinability. As friction or wear reducing component, inclusions of manganese sulphide or tungsten sulphide in the pre-alloyed powder may be used.
摘要:
A valve seat of an iron-based sintered alloy having high wear resistance in a wide temperature range, which can be used in direct injection engines with improved fuel efficiency, low emission and high power, is obtained by limiting the amount of a solid lubricant dispersed in the matrix of the valve seat of an iron-based sintered alloy, and dispersing at least two types of hard particles having different hardnesses in the matrix, thereby providing high strength and self-lubrication, as well as improved wear resistance under no lubrication in a wide temperature range.
摘要:
A powder metal material comprises pre-alloyed iron-based powder including carbon present in an amount of 0.25 to 1.50% by weight of the pre-alloyed iron-based powder. Graphite is admixed in an amount of 0.25 to 1.50% by weight of the powder metal material. The admixed graphite includes particles finer than 200 mesh in an amount greater than 90.0% by weight of the admixed graphite. Molybdenum disulfide is admixed in an amount of 0.1 to 4.0% by weight of the powder metal material, copper is admixed in an amount of 1.0 to 5.0% by weight of the powder metal material, and the material is free of phosphorous. The powder metal material is then compacted and sintered at a temperature of 1030 to 1150° C. At least 50% of the admixed graphite of the starting powder metal material remains as free graphite after sintering.