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公开(公告)号：US3739445A
公开(公告)日：1973-06-19
申请号：US3739445D
申请日：1970-12-29
Applicant: CHROMALLOY AMERICAN CORP
CPC classification number: C22C33/0278 , B22F3/14 , C22C32/0026 , Y10S75/951
Abstract: A powder metallurgy produced wear resistant magnetic pole piece for use as a pickup head with magnetic playback tapes is provided made of a magnetically soft ferrous alloy containing effective amounts of silicon and aluminum. A powder of the alloy is oxidized to provide a thin oxide on the particles thereof. The powder is then hot pressed in vacuum at an elevated temperature into a dense sintered body. The presence of oxide in the grain boundaries confers wear resistant properties to the alloy. An oxygen content of about 3,400 to 4,400 ppm is preferred.
Abstract translation: 粉末冶金制造的耐磨磁极片用作具有磁回放带的拾取头，由含有有效量的硅和铝的磁软铁合金制成。 该合金的粉末被氧化以在其颗粒上提供薄的氧化物。 然后将粉末在高温下真空热压成致密的烧结体。 晶界中氧化物的存在赋予合金耐磨性能。 氧含量优选为约3,400至4,400ppm。
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2.发明授权Wear resistant powder metal magnetic pole piece made from oxide coated fe-al-si powders 失效耐磨粉末由氧化物涂层的FE-AL-SI粉末制成的金属磁性片
公开(公告)号：US3814598A
公开(公告)日：1974-06-04
申请号：US34534373
申请日：1973-03-27
Applicant: CHROMALLOY AMERICAN CORP
CPC classification number: C22C33/0278 , B22F3/14 , C22C32/0026 , Y10S428/928
Abstract: A POWDER METALLURGY PRODUCED WEAR RESISTANT MAGNETIC POLE PIECE FOR USE AS A PICKUP HEAD WITH MAGNETIC PLAYBACK TAPES IS PROVIDED MADE FOR A MAGNETICALLY SOFT FERROUS ALLOY CONTAINING EFFECTIVE AMOUNTS OF SULICON AND ALUMINUM. A POWDER OF THE ALLOY IS OXIDIZED TO PROVIDE A THIN OXIDE ON THE PARTICLE THEREOF. THE POWDER IS THEN HOT PRESSED IN VACUUM AT AN ELEVATED TEMPERATURE INTOS DENSE SINERED BODY. THE PRESENCE OF OXIDE OF OXIDE IN THE GRAIN BOUNDRIES CONFERS WEAR RESISTANT PROPERTIES TO THE ALLOY AN OXYGEN CONTENT OF ABOUT 3400 TO 4400 P.P.M. IS PREFERRED.
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