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公开(公告)号：US5273098A
公开(公告)日：1993-12-28
申请号：US833790
申请日：1992-02-12
CPC分类号： B22C9/105
摘要： A method for the manufacture of salt cores is described. The cores are used for the production of cavities in articles which have been made by a pressure casting technique. The cores are resistant to impregnation and fracture during, for example, the application of pressure during squeeze casting. In particular, the method comprises mixing coarse and fine particle salt powders in the ratio from 50/50 to 70/30 coarse/fine, the coarse powder having a maximum particle size of 250 micrometers, the fine powder having a maximum particle size of 25 micrometers. A lubricant, for example, oleic acid is added, possibly the quantity thereof being in the range 0. 1 to 1.0 wt %. A surfactant, such as a silane, also may be added, possibly the quantity thereof being in the range 0.1 to 1.0 wt %. The mixture is pressed to form a core having a density of at least 1.90 g/cm.sup.3 ; and is sintered at a temperature between 650.degree. C. and 775.degree. C., for a time in the range 15 minutes to 1 hour.
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公开(公告)号：US5037588A
公开(公告)日：1991-08-06
申请号：US514208
申请日：1990-04-25
IPC分类号： C04B35/573
CPC分类号： C04B35/573
摘要： A method of making a siliconized silicon carbide article by(i) injection-molding a mixture which comprises a major proportion of silicon carbide particles and a minor proportion of organic binder material, the mixture being flowable under heat and pressure,(ii) heating the molded article thus formed so as to remove the organic binder material from it and obtain a porous silicon carbide body containing elemental carbon, and(iii) impregnating the porous body with molten silicon to convert said carbon to silicon carbide which binds together the original silicon carbide particles,in which step (iii) is carried out by utilizing as a conduit for said molten silicon the sprue that is formed integrally with the injection-molded article in step (i).The method avoids excessive contact between the surface of the porous intermediate shaped body and molten silicon employed for siliconization, and so reduces the possibility of damage to that body while it is in the weakly bonded state.
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公开(公告)号：US4908034A
公开(公告)日：1990-03-13
申请号：US314285
申请日：1989-02-23
CPC分类号： A61F2/3609 , A61F2002/30112 , A61F2002/30121 , A61F2002/30125 , A61F2002/30153 , A61F2002/30156 , A61F2002/30187 , A61F2002/30355 , A61F2002/30367 , A61F2002/30377 , A61F2002/30474 , A61F2002/308 , A61F2002/3631 , A61F2002/3647 , A61F2002/365 , A61F2220/0025 , A61F2220/0033 , A61F2230/0004 , A61F2230/0006 , A61F2230/0008 , A61F2230/0019 , A61F2230/0023 , A61F2230/0034
摘要： An endoprosthetic bone component is produced from parts respectively having a projection and cavity engaged in a mutual clearance fit, and a third part of plastics material located in the space of such fit, the space and third part being dimensioned to inhibit ejection of the latter and to lock the two parts against mutual articulation during post-operative use. Normally the space and third part will be of generally uniform thickness overall which is small compared to that of the projection. Also the projection and cavity are preferably of uniform cross-sectional shape over at least major portions thereof. Typically the two parts will be of different materials, such as ceramic and metal, suited respectively to articulation and bone fixation roles.
摘要翻译： 假体内骨组件由分别具有以相互间隙配合接合的突起和空腔的部件和位于这种配合空间的塑料材料的第三部分制成，空间和第三部分的尺寸被限制为抑制后者的弹射， 在手术后使用两个部件来锁定相互关节。 通常，空间和第三部分的整体厚度通常为均匀，与投影的厚度相比较小。 此外，突起和空腔的至少主要部分优选地具有均匀的横截面形状。 通常，这两个部分将具有不同的材料，例如陶瓷和金属，分别适合于关节和骨固定的作用。
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公开(公告)号：US4838149A
公开(公告)日：1989-06-13
申请号：US096901
申请日：1987-09-15
CPC分类号： F02F7/0087 , F02F3/14 , F02F2200/04 , F05C2201/021 , F05C2201/0433 , F05C2201/0448 , F05C2251/042
摘要： Pistons for internal combusion engines are described. The pistons comprise a crown component and a skirt component wherein the crown component consists of an iron or nickel based alloy annular portion having fitted directly therein a ceramic insert, the crown component being joined to the skirt component by an annular composite laminated member of steel and aluminium alloy the steel of the laminated member being energy beam welded to the annular portion of the crown component and the aluminum alloy of the laminated member being energy beam welded to the skirt component there being after welding a sealed, hollow, annular chamber disposed at the junction between the crown component and the skirt component. Embodiments are described having ceramic inserts of silicon nitride and including combustion bowls.
摘要翻译： 描述内部混合发动机的活塞。 活塞包括冠组件和裙部组件，其中冠组件由铁或镍基合金环形部分组成，其直接嵌入陶瓷插入件中，冠组件通过钢的环形复合层压构件连接到裙部组件， 铝合金，层压构件的钢是能量束焊接到冠部组件的环形部分，并且层压构件的铝合金是能量束焊接到裙部组件，在焊接之后的密封的中空的环形室中， 冠部组件和裙部组件之间的连接处。 描述了具有氮化硅陶瓷插入件并包括燃烧碗的实施例。
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