摘要:
The present invention relates to improved metallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. Ejection properties, such as stripping pressure and sliding pressure, of compacted parts can be improved by using the solid lubricants. The solid lubricants contain functionalized polyalkylene glycol lubricants that contain a phosphate group, phosphite group, hypophosphate group, hypophosphite group, polyphosphate group, thiophosphate group, dithiophosphate group, thiocarbamate group, dithiocarbamate group, borate group, thiosulfate group, sulfate group, a sulfonate group or combinations thereof.
摘要:
The present invention relates to improved metallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. The solid lubricants contain functionalized polyalkylene lubricants substituted with functional groups selected from the group consisting of a phosphate group, phosphite group, hypophosphate, hypophosphite, polyphosphate, thiophosphate, dithiophosphate, thiocarbamate, dithiocarbamate, borate, thiosulfate, sulfate group, or sulfonate group.
摘要:
The present invention relates to improved matallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. Ejection properties, such as stripping pressure and sliding pressure, of compated parts can be improved by using the solid lubricants.The solid lubricants contain functionalized polyalkylene lubricants have the formula: R1 Q- R2 where Q is a linear or branched, polyalkylene containing from about 10 to about 200 carbon atoms, and R1 and R2 are each independently a hydroxyl group, a carboxylic acid group or a metal salt thereof, an amine group, a mono- or di- C1 to C25 alkyl substituted amine group, or an alkylene oxide group having the formula: -[(CH2)qO]nH where q is from about 1 to about 7, n is from about 1 to about 100.
摘要:
Improved methods for coating particulate materials at low shear conditions and preferably below the melting point of the coating material are provided. In one aspect, metallurgical compositions are provided that contain a metal-based powder bound to an alloying powder or powders by way of a low melting polymer or wax binding agent, which is preferably polyethylene. The binding agent is blended with the metal-based and alloying powders at elevated temperatures preferably below the melting point of the binding agent. The bonded metallurgical composition can be used in compaction processes to manufacture compacted parts that can be sintered to impact strength.
摘要:
The present invention relates to improved matallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. Ejection properties, such as stripping pressure and sliding pressure, of compated parts can be improved by using the solid lubricants.The solid lubricants contain functionalized polyalkylene lubricants have the formula: R1 Q- R2 where Q is a linear or branched, polyalkylene containing from about 10 to about 200 carbon atoms, and R1 and R2 are each independently a hydroxyl group, a carboxylic acid group or a metal salt thereof, an amine group, a mono- or di- C1 to C25 alkyl substituted amine group, or an alkylene oxide group having the formula: -[CH2qO]nH where q is from about 1 to about 7, n is from about 1 to about 100.
摘要:
This invention relates to ferromagnetic powder compositions and compacted articles made from the same. The ferromagnetic powder compositions of the invention are formulated with a thermoplastic and a fluoric resin, such as polytetrafluoroethylene, which provides powder mixtures with good flow properties and good uniformity. Compacted articles made from the ferromagnetic powder compositions of the invention show reduced core losses and have good magnetic permeability over an extended frequency range. These compacted articles also exhibit high green density and good ejection characteristics.
摘要:
The present invention relates to improved metallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. Ejection properties, such as stripping pressure and sliding pressure, of compacted parts can be improved by using the solid lubricants. The solid lubricants contain functionalized polyalkylene glycol lubricants that contain a phosphate group, phosphite group, hypophosphate group, hypophosphite group, polyphosphate group, thiophosphate group, dithiophosphate group, thiocarbamate group, dithiocarbamate group, borate group, thiosulfate group, sulfate group, a sulfonate group or combinations thereof.
摘要:
A method is provided for compacting metal-based powder compositions containing at least one thermoplastic material at temperatures below the glass transition temperature or melting temperature of the thermoplastic material to form a metal-based component. Preferably, compaction is carried out at temperatures ranging from ambient to about 55 °C. The method of present invention is particularly useful for making magnetic core components. The present invention also provides metal-based powder compositions useful for cold compaction. The metal based powder compositions contain metal-based particles containing no iron phosphate layer; a thermoplastic material selected from polyetherimides, polyphenylene ethers, polyethersulfones, polycarbonates, polyethylene glycol, polyvinyl acetate, polyvinyl alcohol or combinations thereof; and an oligomer of a polyamide.
摘要:
Metallurgical powder compositions are provided which contain a metal powder in admixture with a solid, particulate polyether lubricant. The incorporation of the polyether lubricant enhances the green strength properties of compacted parts made from the powder compositions, and generally reduces the ejection forces required to remove the compacted part from the die cavity.