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    Silicon nitride powder of low oxygen content
    3.
    发明授权
    Silicon nitride powder of low oxygen content 失效
    低氧含量的氮化硅粉末

    公开(公告)号：US4983371A

    公开(公告)日：1991-01-08

    申请号：US396328

    申请日：1989-08-21

    申请人： Ulrike Pitzer ,  Benno Laubach ,  Gerhard Franz

    发明人： Ulrike Pitzer ,  Benno Laubach ,  Gerhard Franz

    IPC分类号： C01B21/068

    CPC分类号： C01B21/068 ,  C01P2006/12

    摘要： Si.sub.3 N.sub.4 powder wherein the total oxygen content of the powder is 0.4% by weight or less is produced by preparing an amorphous Si.sub.3 N.sub.4 intermediate by reacting a Si-containing compound with an N-containing compound and the intermediate is then crystallized wherein "P", multiplication product of(i) the specific surface of the amorphous intermediate (BET in m.sup.2 /g),(ii) the moisture content C.sub.H.sbsb.2.sub.O (in volume ppm) of the atmosphere during handling and(iii) the time t in hours required for handling the amorphous intermediate,is kept smaller than the limit value product P.sub.G of 1000 in accordance with the following equation:"P"=BET (m.sup.2 /g).times.C.sub.H.sbsb.2.sub.O (vol ppm).times.t(h)

    摘要翻译： 通过使含Si的化合物与含N的化合物反应制备无定形的Si 3 N 4中间产物，其中粉末的总氧含量为0.4重量％以下的Si 3 N 4粉末，然后使中间体结晶，其中“P” （i）无定形中间体的比表面积（BET / m2 / g），（ii）处理过程中气氛的水分CH 2 O（体积ppm）的产物和（iii）处理所需的时间t 无规中间体根据下式保持小于1000的极限值乘积PG：“P”= BET（m 2 / g）×CH 2 O（体积ppm）×t（h）

    Silicon nitride powders of low isoelectric point and processes for their production
    4.
    发明授权
    Silicon nitride powders of low isoelectric point and processes for their production 失效
    低电导点的硅氮化物粉末及其生产工艺

    公开(公告)号：US5066473A

    公开(公告)日：1991-11-19

    申请号：US579236

    申请日：1990-09-04

    申请人： Ulrike Pitzer ,  Gerhard Franz ,  Benno Laubach

    发明人： Ulrike Pitzer ,  Gerhard Franz ,  Benno Laubach

    IPC分类号： C01B21/068

    CPC分类号： C01B21/0687

    摘要： Silicon nitride powder having a total oxygen content of less than 1.8% by weight and an isoelectric point in 0.001M aqueous KNO.sub.3 solution of below pH 4 is prepared by calcining Si.sub.3 N.sub.4 powder having an oxygen content of 0.4% by weight or less in an oxygen containing atmosphere at temperatures between 700.degree. and 1200.degree. C. for 15 to 90 minutes or by grinding such as Si.sub.3 N.sub.4 powder in water, lower alcohol or a water/alcohol mixture for 15 to 120 minutes.

    摘要翻译： 通过在氧含量为0.4重量％以下氧化氧含量为0.4重量％以下的Si 3 N 4粉末，制备总氧含量小于1.8重量％的含有低于pH 4的0.001M KNO 3水溶液中的等电点的氮化硅粉末 气温在700〜1200℃的温度下浸渍15〜90分钟，或者研磨如Si3N4粉末在水，低级醇或水/醇混合物中15〜120分钟。

    Non-silking iron oxide yellow pigments with high color density
    7.
    发明授权
    Non-silking iron oxide yellow pigments with high color density 有权
    无色氧化铁黄色颜料，颜色密度高

    公开(公告)号：US6053972A

    公开(公告)日：2000-04-25

    申请号：US192632

    申请日：1998-11-16

    申请人： Ulrike Pitzer ,  Rolf Naumann ,  Rolf-Michael Braun

    发明人： Ulrike Pitzer ,  Rolf Naumann ,  Rolf-Michael Braun

    IPC分类号： C01G49/02 ,  C08K3/22 ,  C09C1/22 ,  C09C1/24 ,  C09D7/12

    CPC分类号： C09D7/1225 ,  C08K3/22 ,  C09C1/22 ,  C01P2006/60

    摘要： Non-silking iron oxide yellow pigments with high color density.Iron oxide yellow pigments in the .alpha.-FeOOH modification with a silking index of less than 5 were obtained in whicha) .alpha.-FeOOH seeds are produced by precipitation from an Fe(II)-containing solution with an alkaline precipitating agent in the presence of soluble aluminium salts in an amount of 3 to 9 wt. %. calculated as Al.sub.2 O.sub.3, with respect to precipitated .alpha.-FeOOH, and subsequent oxidation to .alpha.-FeOOH andb) pigment growth is performed by precipitating further iron with simultaneous oxidation, wherein the seed/time yield is less than 0.3 h.sup.-1 and the pH value is less than 3.9 over the entire period of pigment growth andc) pigment growth is terminated at a reproduction factor between 3 and 20.

    摘要翻译： 无色氧化铁黄色颜料，颜色密度高。 获得了具有小于5的丝绒指数的α-FeO​​OH改性中的氧化铁黄色颜料，其中a）通过在含碱性沉淀剂的Fe（II）溶液中沉淀，在存在 可溶性铝盐的用量为3〜9wt。 ％。 以Al 2 O 3计算，相对于析出的α-FeO​​OH，随后氧化成α-FeO​​OH，b）通过同时氧化沉淀进一步的铁进行颜料生长，其中种子/时间产率小于0.3h -1，pH 在颜料生长的整个周期中，值小于3.9，c）颜色生长在3和20之间的繁殖因子下终止。

    Silicon nitride powders with improved surface properties and processes for their preparation
    10.
    发明授权
    Silicon nitride powders with improved surface properties and processes for their preparation 失效
    具有改善表面性能的氮化硅粉末及其制备方法

    公开(公告)号：US5030434A

    公开(公告)日：1991-07-09

    申请号：US579237

    申请日：1990-09-04

    申请人： Ulrike Pitzer ,  Gerhard Franz ,  Benno Laubach

    发明人： Ulrike Pitzer ,  Gerhard Franz ,  Benno Laubach

    IPC分类号： C01B21/068

    CPC分类号： C01B21/0687 ,  C01P2002/74 ,  C01P2004/62 ,  C01P2006/12

    摘要： Si.sub.3 N.sub.4 powders having a total oxygen content of less than 1.8% by weight with the proportion of surface oxygen content of more than 65% of the total oxygen content, and having a fluorine content of less than 35 ppm are prepared by annealing Si.sub.3 N.sub.4 powders having a total oxygen content of less than or equal to 0.4% by weight in an oxygen-containing atmosphere at temperatures of 700.degree. C. to 1200.degree. C. for 15 to 90 minutes or by grinding Si.sub.3 N.sub.4 powders having a total oxygen content of less than or equal to 0.4% by weight in water, alcohol or aqueous alcohol 15 to 120 minutes.

    摘要翻译： 总氧含量小于1.8重量％，表面氧含量占总氧含量的65％以上，氟含量小于35ppm的Si 3 N 4粉末是通过退火具有 在含氧气氛中，在700℃至1200℃的温度下，总氧含量小于或等于0.4重量％，持续15至90分钟，或通过研磨总氧含量低于或等于或等于或等于0的Si 3 N 4粉末， 在水，醇或含水醇中等于0.4重量％至15分钟至120分钟。