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42 条记录 (耗时 0.021 秒)

    Process for separating short fibers
    31.
    发明授权
    Process for separating short fibers 失效
    分离短纤维的方法

    公开(公告)号：US4843041A

    公开(公告)日：1989-06-27

    申请号：US866806

    申请日：1986-05-27

    申请人： Vimal K. Pujari

    发明人： Vimal K. Pujari

    IPC分类号： C04B35/486 ,  C04B35/80

    CPC分类号： C04B35/803 ,  C04B35/486

    摘要： Fibers for use in forming fiber reinforced ceramic composites may be effectively deagglomerated and/or dispersed in the precursor from which the continuous phase of the composite is to be derived by passing the fibers through a screen with openings that are from two to ten times as wide as the fiber diameter. By using this technique, composites of alumina fibers in a partially stabilized zirconia matrix have been prepared with better fiber orientation and fiber aspect ratio than previously achieved.

    摘要翻译： 用于形成纤维增强陶瓷复合材料的纤维可以有效地被分散和/或分散在前体中，通过使纤维通过具有两倍至十倍宽度的开口的筛网来获得复合材料的连续相， 作为纤维直径。 通过使用这种技术，已经制备了部分稳定的氧化锆基质中的氧化铝纤维的复合材料，其具有比先前实现的更好的纤维取向和纤维纵横比。

    Method for improving thermal shock resistance of honeycombed structures formed from joined cellular segments
    32.
    发明授权
    Method for improving thermal shock resistance of honeycombed structures formed from joined cellular segments 失效
    用于提高由连接的细胞片段形成的蜂窝结构的耐热冲击性的方法

    公开(公告)号：US4335783A

    公开(公告)日：1982-06-22

    申请号：US205775

    申请日：1980-11-10

    申请人： Robert D. McBrayer ,  Vimal K. Pujari

    发明人： Robert D. McBrayer ,  Vimal K. Pujari

    IPC分类号： F28D19/00 ,  F28F21/04

    CPC分类号： F28F21/04 ,  F28D19/042 ,  Y10S165/016 ,  Y10T428/24149 ,  Y10T428/24793

    摘要： A method of improving the thermal shock resistance of a honeycombed structure through which fluids flow and formed by joining a plurality of cellular segments to one another along their peripheral walls, by providing discontinuities through the joints formed between the adjoining segments in the direction of the fluid flow through the structure so as to lessen temperature differences occurring in the joint area, to provide the structure with greater flexibility and to act as crack arrestors lessening the transmission of stresses between adjoining segments and through the joints. In two preferred embodiments, the invention is practiced in forming a heat recovery wheel by joining a plurality of cellular segments to one another with cement which is striped to the segments so as to form a plurality of hollow, straight walled, channels extending essentially axially through some or all of the joint areas of the resulting wheel.

    摘要翻译： 一种提高蜂窝结构的耐热冲击性的方法，通过这种结构，通过在流体的方向上通过邻接的段之间形成的接头提供不连续性，流体通过其流动而流动并形成，所述方法通过使多个细胞链段沿其周壁彼此连接而形成 流过该结构以便减小在接合区域中发生的温度差异，为结构提供更大的灵活性，并且用作减少相邻节段和通过接头之间的应力传递的防裂器。 在两个优选实施例中，本发明通过将多个细胞节段彼此连接而形成热回收轮来实施，其中水泥彼此分隔，以便形成多个中空的直壁通道，其基本上轴向延伸穿过 所得车轮的一些或全部关节区域。

    Method for improving thermal shock resistance of honeycombed structures formed from joined cellular segments
    33.
    发明授权
    Method for improving thermal shock resistance of honeycombed structures formed from joined cellular segments 失效
    用于提高由连接的细胞片段形成的蜂窝结构的耐热冲击性的方法

    公开(公告)号：US4333518A

    公开(公告)日：1982-06-08

    申请号：US205776

    申请日：1980-11-10

    申请人： Rodney I. Frost ,  Robert D. McBrayer ,  Vimal K. Pujari

    发明人： Rodney I. Frost ,  Robert D. McBrayer ,  Vimal K. Pujari

    IPC分类号： F28D19/04 ,  F28F21/04 ,  B32B3/12 ,  B32B1/08

    CPC分类号： F28F21/04 ,  F28D19/042 ,  Y10S165/042 ,  Y10T428/218 ,  Y10T428/24149 ,  Y10T428/24793

    摘要： The thermal shock resistance of a honeycombed structure or a structure having a honeycombed surface formed by bonding together a plurality of cellular segments each having a honeycombed face forming a portion of the structure or surface of the structure, respectively, is improved by recessing the bond joints between the joined cellular segments from the surface. The thermal shock resistance of a heat recovery wheel operated in a counterflow heat exchanger system and formed from joined cellular segments is improved by recessing the bond joints joining the cellular segments, preferably approximately one-half inch (12.7 mm), from the face of the wheel exposed to the gases at their highest temperatures.

    摘要翻译： 蜂窝结构或具有蜂窝表面的结构的耐热冲击性通过将形成结构或结构的一部分的蜂窝面分别连接在一起而形成的蜂窝结构的结构的耐热冲击性分别通过使接合接头 在来自表面的连接的细胞片段之间。 在逆流换热器系统中操作并由连接的细胞节段形成的热回收轮的耐热冲击性通过将接合细胞片段的接合接合部分（优选为约半英寸（12.7mm））从 车轮在最高温度下暴露于气体。

    High Toughness Ceramic Composites
    35.
    发明申请
    High Toughness Ceramic Composites 审中-公开
    高韧性陶瓷复合材料

    公开(公告)号：US20110175264A1

    公开(公告)日：2011-07-21

    申请号：US12841432

    申请日：2010-07-22

    申请人： Vimal K. Pujari ,  Eric Jorge ,  Christopher J. Reilly

    发明人： Vimal K. Pujari ,  Eric Jorge ,  Christopher J. Reilly

    IPC分类号： C04B35/565 ,  C04B35/563 ,  C04B35/532 ,  B82Y30/00

    CPC分类号： C04B35/565 ,  B82Y30/00 ,  C04B35/62655 ,  C04B35/62695 ,  C04B2235/3821 ,  C04B2235/3843 ,  C04B2235/3895 ,  C04B2235/422 ,  C04B2235/424 ,  C04B2235/48 ,  C04B2235/5288 ,  C04B2235/5409 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/608 ,  C04B2235/723 ,  C04B2235/77 ,  C04B2235/96

    摘要： A method of forming a sintered silicon carbide body includes mixing silicon carbide powder having an oxygen content of less than about 3 wt % and having a surface area in a range of between about 8 m2/g and about 15 m2/g, with boron carbide powder and carbon sintering aid to form a green silicon carbide body. Alternatively, a method of producing a sintered silicon carbide body includes mixing the silicon carbide powder with titanium carbide powder having an average particle diameter in a range of between about 5 nm and about 100 nm and with carbon sintering aid to form a green silicon carbide body. In another alternative, a method of forming a sintered silicon carbide body includes mixing silicon carbide powder with boron carbide powder, the titanium carbide powder, and carbon sintering aid to form a green silicon carbide body. After sintering, the silicon carbide bodies have a density at least 98% of the theoretical density of silicon carbide.

    摘要翻译： 形成烧结碳化硅本体的方法包括将具有小于约3重量％的氧含量的碳化硅粉末与表面积在约8m 2 / g至约15m 2 / g范围内的碳化硼混合， 粉末和碳烧结助剂形成绿色碳化硅体。 或者，制造烧结碳化硅体的方法包括将碳化硅粉末与平均粒径在约5nm至约100nm范围内的碳化钛粉末和碳烧结助剂混合以形成绿碳化硅体 。 在另一个替代方案中，形成烧结碳化硅本体的方法包括将碳化硅粉末与碳化硼粉末，碳化钛粉末和碳烧结助剂混合以形成绿碳化硅体。 烧结后，碳化硅体的密度为碳化硅理论密度的至少98％。