Surface modification method for inorganic oxide powder, powder produced by the method and use of the powder
    43.
    发明授权
    Surface modification method for inorganic oxide powder, powder produced by the method and use of the powder 有权
    无机氧化物粉末的表面改性方法,粉末的制造方法和用途

    公开(公告)号:US07425287B2

    公开(公告)日:2008-09-16

    申请号:US10543099

    申请日:2004-01-23

    Abstract: A surface modification method comprising bringing, into a high-temperature flame formed by use of a combustible gas and a combustion-supporting gas, inorganic oxide powder A having an average particle size falling within a range of 0.5 to 200 μm as measured by means of laser diffraction/scattering particle size analysis and inorganic oxide powder B having a particle size calculated on the basis of its BET specific surface area of 100 nm or less, to thereby modify the surfaces of particles of the powder A by means of the particles of the powder B. A surface modification method comprising bringing, into a high-temperature flame formed by use of a combustible gas and a combustion-supporting gas, the inorganic oxide powder A; and bringing again the resultant powder into the high-temperature flame, to thereby modify the surfaces of particles of powder A.

    Abstract translation: 一种表面改性方法,其特征在于,将通过使用可燃性气体和助燃气体形成的高温火焰,平均粒径在0.5〜200μm的范围内的无机氧化物粉末A 激光衍射/散射粒度分析和基于BET比表面积计算的粒径为100nm以下的无机氧化物粉末B,由此通过粒子的粒子来改变粉末A的粒子的表面 粉末B.一种表面改性方法,包括将无机氧化物粉末A引入到使用可燃性气体和助燃气体形成的高温火焰中; 并将所得粉末再次进入高温火焰,从而改变粉末A的颗粒表面。

    Chromium dioxide (CrO2) and composites of chromium dioxide and other oxides of chromium such as CrO2/Cr2O3 and CrO2/Cr2O5) and process for manufacturing the same
    46.
    发明授权
    Chromium dioxide (CrO2) and composites of chromium dioxide and other oxides of chromium such as CrO2/Cr2O3 and CrO2/Cr2O5) and process for manufacturing the same 有权
    二氧化铬(CrO 2)和二氧化铬和其它铬的氧化物如CrO 2 / Cr 2 O 3和CrO 2 / Cr 2 O 5的复合物)及其制造方法

    公开(公告)号:US07276226B2

    公开(公告)日:2007-10-02

    申请号:US10525939

    申请日:2003-08-22

    Abstract: A novel process for preparing chromium dioxide of substantially high purity as well as composites of CrO2/Cr2O3 and CrO2/Cr2O5 following a sequence of simple steps. The process does not require pressure as a control parameter during the process of synthesis. No chemical modifier has been used to bring down the working pressure during synthesis. Fairly hard sintered pellets of CrO2 can be obtained without introducing any detectable impurity phase that usually appears during the process of sintering. Further, CrO2/Cr2O3 and CrO2/Cr2O5 composites have also been prepared where the fraction of insulating Cr2O3 or Cr2O5 in metallic CrO2 can be easily controlled. Significant negative magnetoresistance is found in pure CrO2 (5% MR) as well as CrO2/Cr2O3 (33% MR) composites near room temperature. The MR studies on the CrO2/Cr2O5 composites have been done and significant negative MR (22%) has been found in CrO2/Cr2O5 composites near room temperature.

    Abstract translation: 一种用于制备基本上高纯度的二氧化铬以及CrO 2 / Cr 2 O 3 N 3和CrO 2 2的复合材料的新方法 按照简单步骤的顺序进行。 该方法在合成过程中不需要作为对照参数的压力。 没有使用化学改性剂降低合成过程中的工作压力。 可以在不引入在烧结过程中通常出现的任何可检测的杂质相的情况下获得CrO 2 2的非常硬的烧结颗粒。 此外,CrO 2 / Cr 2 O 3和CrO 2 / Cr 2 O 3和/ 还制备了O 5复合物,其中绝缘Cr 2 O 3 O 3或Cr 2 O 3的比例 5 可以容易地控制。 在纯CrO 2(5%MR)以及CrO 2 / Cr 2 O 3 3中发现显着的负磁阻。 SUB>(33%MR)复合材料在室温附近。 已经完成了对CrO 2 / Cr 2 O 5复合物的MR研究,并且在CrO中已经发现显着的负MR(22%) 在室温附近的复合材料是2×2 2 5。

Patent Agency Ranking