Aluminum nitride flakes and spheres
    2.
    发明授权
    Aluminum nitride flakes and spheres 失效
    氮化铝薄片和球体

    公开(公告)号:US4908197A

    公开(公告)日:1990-03-13

    申请号:US334612

    申请日:1989-04-07

    摘要: Methods are described for preparing aluminum nitride of controllable morphology for ceramic and heat conduction applications. The methods comprise forming spherical particles or flakes of an intermediate, RA1NH, followed by heating the spheres or flakes of RA1NH at elevated temperatures to produce high purity aluminum nitride of corresponding morphology. Spheres of RA1NH are formed by (i) freezing a suspension of RA1NH in a liquid medium and thawing, by (ii) aging the suspension, or by (iii) dissolving RA1NH in a liquid medium and precipitating it. Flakes are formed by freezing a suspension of RAINH in a liquid medium and removing frozen medium from the frozen suspension.

    摘要翻译: 描述了用于制备用于陶瓷和热传导应用的可控形态的氮化铝的方法。 所述方法包括形成中间体RA1NH的球形颗粒或薄片,然后在升高的温度下加热RA1NH的球体或薄片以产生相应形态的高纯氮化铝。 RAINH的球体通过以下步骤形成:(i)通过(ii)老化悬浮液或(iii)将RA1NH溶解在液体介质中并使其沉淀,将液体介质中的RA1NH的悬浮液冷冻并融化形成。 通过将液体介质中的RAINH的悬浮液冷冻并从冷冻悬浮液中除去冷冻介质形成片。

    Aluminum nitride flakes and spheres
    3.
    发明授权
    Aluminum nitride flakes and spheres 失效
    氮化铝薄片和球体

    公开(公告)号:US5164263A

    公开(公告)日:1992-11-17

    申请号:US454667

    申请日:1989-12-21

    IPC分类号: C01B21/072 C04B35/581

    摘要: Methods are described for preparing aluminum nitride of controllable morphology for ceramic and heat conduction applications. The methods comprise forming spherical particles or flakes of an intermediate, RAlNH, followed by heating the spheres or flakes of RAlNH at elevated temperatures to produce high purity aluminum nitride of corresponding morphology. Spheres of RAlNH are formed by (i) freezing a suspension of RAlNH in a liquid medium and thawing, by (ii) aging the suspension, or by (iii) dissolving RAlNH in a liquid medium and precipitating it. Flakes are formed by freezing a suspension of RAlNH in a liquid medium and removing frozen medium from the frozen suspension.

    摘要翻译: 描述了用于制备用于陶瓷和热传导应用的可控形态的氮化铝的方法。 该方法包括形成中间体RANNH的球形颗粒或薄片,然后在升高的温度下加热RANNH的球体或薄片以产生相应形态的高纯氮化铝。 RAINH的球体通过以下步骤形成:(i)通过(ii)使悬浮液老化或(iii)将RANNH溶解在液体介质中并使其沉淀,将RANNH的悬浮液冷冻在液体介质中并解冻。 通过将RANNH的悬浮液冷冻在液体介质中并从冷冻悬浮液中除去冷冻介质形成片。

    High strength aluminum nitride fibers and composites and processes for
the preparation thereof
    5.
    发明授权
    High strength aluminum nitride fibers and composites and processes for the preparation thereof 失效
    高强度氮化铝纤维及其制备方法

    公开(公告)号:US5508239A

    公开(公告)日:1996-04-16

    申请号:US578408

    申请日:1990-09-07

    CPC分类号: C04B35/62272 C04B35/80

    摘要: Shaped articles of polycrystalline aluminum nitride are disclosed having a tensile strength of at least about 100 Kpsi. The shaped articles are preferably fibers. Composites of polycrystalline AlN fibers in a matrix of organic or inorganic polymer, metal, glass or ceramic are also disclosed herein. The process for the preparation of polycrystalline aluminum nitride fibers is covered.

    摘要翻译: 公开了具有至少约100Kpsi的拉伸强度的多晶氮化铝的成型制品。 成形制品优选是纤维。 本文还公开了有机或无机聚合物,金属,玻璃或陶瓷基体中的多晶AlN纤维的复合材料。 覆盖了制备多晶氮化铝纤维的方法。

    Melt-formable organoaluminum polymer
    8.
    发明授权
    Melt-formable organoaluminum polymer 失效
    可熔融的有机铝聚合物

    公开(公告)号:US5041512A

    公开(公告)日:1991-08-20

    申请号:US338020

    申请日:1989-04-14

    摘要: An organoaluminum polymer formed from R.sub.3 A1 and dialkylaluminum amide that is useful for forming shaped articles of inorganic aluminum nitride alone or with nitrides (other than AlN), oxides, borides, carbides or combinations thereof; R being selected from hydrogen; C.sub.1 to C.sub.10 alkyl; halogen; and substituted or unsubstituted phenyl, naphthyl and biphenyl; no more than two of the R groups being alkyl.

    摘要翻译: 由R3A1和二烷基铝酰胺形成的有机铝聚合物,其可用于单独或与氮化物(AlN),氧化物,硼化物,碳化物或其组合形成的无机氮化铝的成形制品; R选自氢; C1〜C10烷基; 卤素; 和取代或未取代的苯基,萘基和联苯基; 不多于两个R基团是烷基。

    Melt-formable organoaluminum polymer
    9.
    发明授权
    Melt-formable organoaluminum polymer 失效
    可熔融的有机铝聚合物

    公开(公告)号:US4696968A

    公开(公告)日:1987-09-29

    申请号:US903448

    申请日:1986-09-04

    摘要: An organoaluminum polymer formed from R.sub.3 Al and R.sub.2 AlNH.sub.2 that is useful for forming shaped articles of inorganic aluminum nitride along or with other nitrides, oxides, carbides or combinations thereof; R being selected from C.sub.x H.sub.2x+1 wherein x is 1 to 10.

    摘要翻译: 由R3Al和R2AlNH2形成的有机铝聚合物,其可用于沿着或与其它氮化物,氧化物,碳化物或其组合形成成形的无机氮化铝制品; R选自CxH2x + 1,其中x为1至10。

    Aluminum fluoride catalyst compositions and use thereof in a
chlorofluorination process for preparing
1,1-dichloro-1,2,2,2-tetrafluoroethane
    10.
    发明授权
    Aluminum fluoride catalyst compositions and use thereof in a chlorofluorination process for preparing 1,1-dichloro-1,2,2,2-tetrafluoroethane 失效
    氟化铝催化剂组合物及其在制备1,1-二氯-1,2,2,2-四氟乙烷氯氟化方法中的用途

    公开(公告)号:US5243108A

    公开(公告)日:1993-09-07

    申请号:US865807

    申请日:1992-04-07

    摘要: A catalyst composition is disclosed which consists essentially of an aluminum fluoride prepared by the reaction of aluminum hydroxide and HF. Also disclosed is a process for preparing 1,1,-dichloro-1,2,2,2-tetrafluoroethane by chlorofluorination which comprises the step of contacting a gaseous mixture comprising at least one tetrahaloethylene having the formula C.sub.2 Cl.sub.4-x F.sub.x wherein x is an integer from zero to 3 and both Cl.sub.2 and HF with said catalyst composition at an elevated temperature; and a process for producing 2-chloro-1,1,1,2-tetrafluoroethane and/or 1,1,1,2-tetrafluoroethane by hydrodechlorinating 1,1-dichloro-1,2,2,2-tetrafluoroethane prepared by said chlorofluorination.

    摘要翻译: 公开了一种催化剂组合物,其基本上由通过氢氧化铝和HF的反应制备的氟化铝组成。 还公开了通过氯氟化制备1,1,1-二氯-1,2,2,2-四氟乙烷的方法,其包括使包含至少一种具有式C 2 Cl 4-x F x的四卤代乙烯的气体混合物接触的步骤,其中x是整数 从0到3,Cl 2和HF与所述催化剂组合物在升高的温度下反应; 以及通过加氢脱氯1,1-二氯-1,2,2,2-四氟乙烷制备2-氯-1,1,1,2-四氟乙烷和/或1,1,1,2-四氟乙烷的方法,所述方法由所述 氯氟化。