Investment casting patterns and method
    4.
    发明授权
    Investment casting patterns and method 失效
    投资模式和方法

    公开(公告)号:US06481490B1

    公开(公告)日:2002-11-19

    申请号:US09237435

    申请日:1999-01-26

    IPC分类号: B22C702

    CPC分类号: B22C7/023 B22C9/043

    摘要: Method of making a shell mold for casting molten metals or alloys involves forming a thermally collapsible, low density reaction injection molded (RIM) thermosetting polyurethane foam pattern having a shape corresponding to the casting to be made. The pattern is formulated to have an aggregate density (pattern outer skin and pattern cellular core) in the range of about 10 to 15 lbs/ft3 and a smooth continuous as-molded surface devoid of surface connected open cells, dimensional stability over a range of temperatures, and ready, ashless burnout from the shell mold formed thereon without cracking the shell mold. The pattern is free of organometallic catalysts that should not be present in the casting of aerospace superalloys, such as nickel and cobalt base superalloys and titanium. The pattern then is invested without the need for any surface polymer or other film or layer in a shell mold.

    摘要翻译: 制造用于铸造熔融金属或合金的壳模的方法包括形成具有与要制造的铸件相对应的形状的热可折叠,低密度反应注塑(RIM)热固性聚氨酯泡沫图案。 该图案被配制为具有在约10至15磅/平方英尺范围内的聚集密度(图案外皮和图案细胞芯),以及没有表面连接开孔的光滑连续成型表面,在一定范围内的尺寸稳定性 温度和准备好,从其上形成的壳模的无灰灼烧而不破坏壳模。 该图案没有有机金属催化剂,不应存在于航空航天超级合金(如镍和钴基超级合金和钛)的铸造中。 然后投资的模式不需要在壳模具中的任何表面聚合物或其它膜或层。

    Catalytic trimerization of polyisocyanates
    5.
    发明授权
    Catalytic trimerization of polyisocyanates 失效
    多异氰酸酯的催化三聚

    公开(公告)号:US4067830A

    公开(公告)日:1978-01-10

    申请号:US671562

    申请日:1976-03-29

    申请人: Jiri E. Kresta

    发明人: Jiri E. Kresta

    IPC分类号: C08G18/16 C08G18/18

    摘要: Compounds (aminimides) of the class wherein a negatively charged nitrogen atom of an acylamide is directly bonded to a cationic nitrogen atom having one hydroxyethyl and two methyl substituents represent uniquely effective catalysts for the trimerization of the isocyanate radical. These aminimides are especially useful as catalysts for the preparation of rigid polyisocyanate-polyisocyanurate foams.

    摘要翻译: 其中酰基酰胺的带负电荷的氮原子与具有一个羟乙基和两个甲基取代基的阳离子氮原子直接键合的化合物(氨基酰亚胺)代表异氰酸酯基团的三聚化的唯一有效的催化剂。 这些氨基酰亚胺特别可用作制备刚性多异氰酸酯 - 聚异氰脲酸酯泡沫的催化剂。