摘要:
A magnetic armature, having an outer ring formed of a first powdered metal, the outer ring having magnetic qualities and the first powdered metal of the outer ring includes metals having poor welding characteristics; an inner ring formed of a second powdered metal and being disposed within the outer ring, the inner ring being an iron metal having good welding characteristics and the inner ring defines an inner opening for receiving a shaft for rotating the magnetic armature; wherein said outer ring and said inner ring are joined together by a sintering process and the shaft is welded to the inner ring.
摘要:
A method of fabricating a fully dense, three dimensional object by direct laser sintering is disclosed. In a chamber with a partial pressure atmosphere, a beam of directed energy melts metallic powder in order to form a solid layer cross section. Another layer of powder is deposited and melted, along with a portion of the previous layer. The energy beam typically is in the form of a laser, scanning along a path resembling a parametric curve or another, arbitrary piecewise parametric curve. In another embodiment, the previous layer is not remelted, thus creating an oxide film that acts as a clean stop to prevent unwanted downward growth.
摘要:
A method for forming a metallic coating on a substrate comprising an intermetallic compound, and the coatings made by this method are disclosed. The method broadly comprises forming an alloyed agglomerate from a precursor comprising at least two metals suitable for forming an intermetallic compound and depositing a coating of the partially converted agglomerate onto a roughened surface of a substrate.
摘要:
Disclosed is a process for manufacturing a sintered slide bearing. A sintered porous bearing body is prepared from a powdered metal material and a resin material in a fluidable state is penetrated into the sintered porous bearing body. The resin material in the sintered porous bearing body is hardened, and the sintered porous bearing body after the hardening of the resin material is repressed to reduce a gap produced between the sintered porous bearing body and the hardened resin material by volume reduction caused on the resin material at the hardening.
摘要:
Formation of sintered metal fiber porous mats used as burner faces and filters comprises dispersing metal fibers in a viscous aqueous solution of one or more cellulose ethers, vacuum molding the dispersed metal fibers on a foraminous support, eliminating residual aqueous cellulose ether from the vacuum molded metal fiber porous mat, and sintering the mat. Water solutions of methylcellulose and/or hydroxypropyl methylcellulose having a viscosity of at least about 1500 centipoises are often used pursuant to this invention.
摘要:
A multi-coating step immersion coating process for producing a coating of a noble metal on a non-noble metal substrate, wherein the noble metal is of a predetermined amount expressed as a percent of the total weight of coated product, and wherein the non-noble metal substrate is in the form of fine particles or a powder is disclosed. The process also utilizes inter-plating step and post-plating step rinsing step sequences which together with the use of the plurality of coating steps consistently results in high quality product having a uniform coating, excellent corrosion resistance and excellent electrical conductivity. Use of the coated products produced according to the process in a variety of electrically conductive compositions, including plastics, adhesives and inks, and in plastic and resin based electromagnetic shielding materials is also disclosed.
摘要:
The present invention concerns a new ferromagnetic powder composition comprising soft magnetic iron-based core particles wherein the surface of the core particles are surrounded by an insulating inorganic coating, and a lubricating amount of a compound selected from the group consisting of silanes, titanates, aluminates, zirconates, or mixtures thereof. The invention also concerns a process for the preparation of soft magnetic composite materials using the new powder composition.
摘要:
A method and apparatus for producing products from a powered base material, by means of so-called free form fabrication, wherein the powder granules are bound together into a solid product.
摘要:
A method of making powder metal compacted parts of multiple dissimilar materials. A die insert is provided having a pattern of cavities corresponding in shape to the shape of a die cavity. The pattern of cavities are filled with two or more dissimilar powder metals which are subsequently pressed within the die cavity to form a compacted powder metal part having at least two discrete regions of dissimilar material.
摘要:
An apparatus for production of fire-resistant cellulose material from agricultural byproducts containing cellulose fiber, comprising a first bath for washing said agricultural byproduct cellulose fiber material, a second bath for receiving and mixing said washed agricultural byproduct cellulose fiber material with an effective amount of an aqueous solution suitable for separating said cellulose fibers, conveyer means disposed between said first bath and said second bath for receiving said separated cellulose fibers and moving washed said cellulose fibers to said second bath, and a third bath for receiving and mixing said mixture of separated cellulose fibers produced in said second bath with an effective amount of an aqueous solution suitable for neutralizing said mixture and for producing a fire retardant chemical precipitated on the surface of said cellulose fibers, and conveyer means disposed between said second bath and said third bath for receiving said separated cellulose fibers and moving said separated cellulose fibers to said third bath.