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    Gel cast molding with fugitive molds
    1.
    发明授权
    Gel cast molding with fugitive molds 失效
    凝胶浇注成型与逃逸模具

    公开(公告)号：US5824250A

    公开(公告)日：1998-10-20

    申请号：US672858

    申请日：1996-06-28

    Applicant: Philip J. Whalen ,  Vikram R. Jamalabad ,  John P. Pollinger ,  Mukesh Agarwala ,  Stephen C. Danforth

    Inventor： Philip J. Whalen ,  Vikram R. Jamalabad ,  John P. Pollinger ,  Mukesh Agarwala ,  Stephen C. Danforth

    IPC: C04B35/622 ,  C04B33/28

    CPC classification number: C04B35/622

    Abstract: A ceramic component is manufactured rapidly using a mold made directly from a solid freeform manufacturing process. Solid freeform fabrication, or rapid prototyping, procedures are used to generate molds of materials that are soluble or otherwise fugitive. A gel casting suspension containing ceramic and emulsifying agents is poured into the cavity of the mold and caused to set. The mold is then removed by dissolution or heat treatment, leaving intact the gelcast part. Conventional procedures are then utilized to densify the gelcast component to the required final component. Time consuming and expensive machine tooling procedures are virtually eliminated. Ceramic components are generated rapidly in a cost effective manner.

    Abstract translation: 使用直接由固体自由形成制造工艺制成的模具快速制造陶瓷部件。 使用固体自由形式制造或快速原型制作程序来生产可溶或其他易失性物质的模具。 将含有陶瓷和乳化剂的凝胶浇注悬浮液倒入模具的腔体中并使其凝固。 然后通过溶解或热处理除去模具，保留凝胶体部分。 然后使用常规程序将凝胶体组分致密化成所需的最终组分。 实际上消除了耗时且昂贵的机床加工程序。 以成本有效的方式快速生成陶瓷部件。

    Methods for producing novel ceramic composites
    5.
    发明授权
    Methods for producing novel ceramic composites 失效
    生产新型陶瓷复合材料的方法

    公开(公告)号：US6004500A

    公开(公告)日：1999-12-21

    申请号：US81308

    申请日：1998-05-19

    Applicant: Ahmad Safari ,  Victor F. Janas ,  Amit Bandyopadhyay ,  Rajesh K. Panda ,  Mukesh Agarwala ,  Stephen C. Danforth

    Inventor： Ahmad Safari ,  Victor F. Janas ,  Amit Bandyopadhyay ,  Rajesh K. Panda ,  Mukesh Agarwala ,  Stephen C. Danforth

    IPC: H01L41/18 ,  H01L41/22 ,  C04B33/32

    CPC classification number: H01L41/37 ,  H01L41/183

    Abstract: A process for making ceramic composites includes the steps of: a) forming a polymer composition into a three-dimensional mold; b) filling said three-dimensional mold with one or more ceramic containing compositions; c) heating said filled mold to dry and sinter the ceramic; d) removing at least a portion of said three-dimensional mold thereby forming voids; and e) filling the voids with a second composition which has a piezoelectric coefficient which is substantially different from the piezoelectric coefficient of said ceramic structure. Steps a through e yield a controlled, non-random piezoelectric ceramic composite having 2-3, 3-2 or 3--3 connectivity with respect to the sintered ceramic and the second composition throughout the composite.

    Abstract translation: 制备陶瓷复合材料的方法包括以下步骤：a）将聚合物组合物形成为三维模具; b）用一种或多种含陶瓷的组合物填充所述三维模具; c）加热所述填充的模具以干燥并烧结陶瓷; d）去除所述三维模具的至少一部分，从而形成空隙; 以及e）用具有与所述陶瓷结构的压电系数基本不同的压电系数的第二组合物填充所述空隙。 步骤a至e产生相对于烧结陶瓷和第二组合物在整个复合材料中具有2-3，3-2或3-3连通性的受控非随机压电陶瓷复合材料。

    Polycrystalline semiconductor processing
    8.
    发明授权
    Polycrystalline semiconductor processing 失效
    多晶半导体加工

    公开(公告)号：US4379020A

    公开(公告)日：1983-04-05

    申请号：US311850

    申请日：1981-10-16

    Applicant: Andreas M. Glaeser ,  John S. Haggerty ,  Stephen C. Danforth

    Inventor： Andreas M. Glaeser ,  John S. Haggerty ,  Stephen C. Danforth

    IPC: C30B1/02 ,  C30B1/10

    CPC classification number: C30B1/023

    Abstract: A process for forming large-grain polycrystalline films from amorphous films for use as photovoltaic devices. The process operates on the amorphous film and uses the driving force inherent to the transition from the amorphous state to the crystalline state as the force which drives the grain growth process. The resultant polycrystalline film is characterized by a grain size that is greater than the thickness of the film.A thin amorphous film is deposited on a substrate. The formation of a plurality of crystalline embryos is induced in the amorphous film at predetermined spaced apart locations and nucleation is inhibited elsewhere in the film. The crystalline embryos are caused to grow in the amorphous film, without further nucleation occurring in the film, until the growth of the embryos is halted by imgingement on adjacently growing embryos. The process is applicable to both batch and continuous processing techniques. In either type of process, the thin amorphous film is sequentially doped with p and n type dopants. Doping is effected either before or after the formation and growth of the crystalline embryos in the amorphous film, or during a continuously proceeding crystallization step.

    Abstract translation: 从用于光伏器件的非晶膜形成大晶粒多晶膜的方法。 该过程在非晶膜上操作，并且使用从非晶状态转变为结晶态的固有的驱动力作为驱动晶粒生长过程的力。 得到的多晶膜的特征在于大于膜的厚度的晶粒尺寸。 薄的非晶膜沉积在基底上。 在非晶膜中以预定的间隔位置诱导多个结晶胚的形成，并且成膜被膜中的其它部分抑制。 使晶体胚在非晶膜中生长，而不会在膜中发生进一步的成核，直到胚胎的生长通过在相邻生长的胚胎上的粘附而停止。 该方法适用于批量和连续加工技术。 在任一种工艺中，薄的非晶膜依次掺杂有p型和n型掺杂剂。 在非晶膜中的结晶胚的形成和生长之前或之后或在连续进行的结晶步骤期间进行掺杂。

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