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high specific area
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  高比表面
    TPR study on doped CeO_2 nano powders with a high specific area
    高比表面掺杂CeO_2纳米粉体的TPR研究
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    Results of infrared test and absorption test show that (1)the new surface structure with a large quantity of hydroxyls(-OH)resulting from high specific energy and high specific area on the surface of nanometer oxide (such as α―Al2O3 etc) through absorption foreign material (such as H2O) ;
    红外光谱、吸附研究表明:高的比表面积和高的表面能使纳米粉强烈吸附外来物质(如水)反应生成新的表面结构(如R—O-H结构),增加了粉间相互作用力和表面活性是纳米氧化物粉团聚的根本原因.
短句来源
    The results show that the adjustment of surface structure on the clean nanometer powders does not cause agglomeration but dispersion, although high specific area and surface energy are the main power of agglomeration.
    研究结果表明:高的比表面积和表面能是纳米粉体团聚的强大动力,但常温下洁净粉体表面的本身结构调整不会导致纳米粉体团聚,只会导致其分散;
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  high specific area
These sphere shells are promising candidates for hydrodesulphurization catalyst due to their high specific area and chemical resistance to sulfur.
      
New alternatives for high specific area γ-Al2O3 synthesis
      
HILDA is also used to follow the changes in the adsorptive energy distribution that occur with annealing a high specific area sodium chloride sample.
      
Interfacial phenomena were assumed to be noticeable owing to the high specific area of this filler.
      
A nano-alumina with high specific area was prepared using a homogeneous precipitation method with titanium dioxide and barium oxide as modifying additives.
      
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This paper aims to do some research on nanometer powder surface structure and dispersed mechanism by analysis of surface physics and surface chemistry and study of the interaction between powders. Results of infrared test and absorption test show that (1)the new surface structure with a large quantity of hydroxyls(-OH)resulting from high specific energy and high specific area on the surface of nanometer oxide (such as α―Al2O3 etc) through absorption foreign material (such as H2O) ; (2)the increase of the...

This paper aims to do some research on nanometer powder surface structure and dispersed mechanism by analysis of surface physics and surface chemistry and study of the interaction between powders. Results of infrared test and absorption test show that (1)the new surface structure with a large quantity of hydroxyls(-OH)resulting from high specific energy and high specific area on the surface of nanometer oxide (such as α―Al2O3 etc) through absorption foreign material (such as H2O) ; (2)the increase of the interaction between powders and surface activity are principal causes of agglomeration of powders, which have important effects on agglomerate and dispersed property of nanometer powders. Approaches of nanometer powder dispersion are presented.

从表面物理与表面化学入手分析了纳米粉体的表面结构,由粉体间的相互作用分析对纳米粉团聚与分散机理进行了研究. 红外光谱、吸附研究表明:高的比表面积和高的表面能使纳米粉强烈吸附外来物质(如水)反应生成新的表面结构(如R—O-H结构),增加了粉间相互作用力和表面活性是纳米氧化物粉团聚的根本原因. 纳米粉表面间化学反应(如-OH基间聚合反应)或生成新的连接物是纳米粉及浆体产生团聚、影响分散性的直接原因. 指出了纳米粉体分散的具体途径.

Agglomerate mechanism of nanometer powders was studied by analysing the surface structure and the interaction between powders in atmosphere. The results show that the adjustment of surface structure on the clean nanometer powders does not cause agglomeration but dispersion, although high specific area and surface energy are the main power of agglomeration. A new surface structure with hydroxyls(-OH) is formed while chemical adsorption and chemical reaction occure due to outside substance such as air and...

Agglomerate mechanism of nanometer powders was studied by analysing the surface structure and the interaction between powders in atmosphere. The results show that the adjustment of surface structure on the clean nanometer powders does not cause agglomeration but dispersion, although high specific area and surface energy are the main power of agglomeration. A new surface structure with hydroxyls(-OH) is formed while chemical adsorption and chemical reaction occure due to outside substance such as air and water. The attraction between nanometer powders because of the action between the hydroxyls(—OH) and the chemical reaction of the hydroxyls are the principal reasons of serious agglomeration of nanometer powders in atmosphere. The methods and mechanisms of preparation of non-agglomerative nanometer powders are disscussed. Vacuum, inert gas treatment and surface modification are suitable for preparation of non-agglomerate nano-powders.

分析了纳米粉体的表面结构与粉体间相互作用,研究了大气环境下纳米粉体的团聚机理及防止纳米粉体团聚的方法。研究结果表明:高的比表面积和表面能是纳米粉体团聚的强大动力,但常温下洁净粉体表面的本身结构调整不会导致纳米粉体团聚,只会导致其分散;外来物质(如空气、水等)在表面发生化学吸附与化学反应后,改变了表面结构和相互作用性质,在粉体表面生成具有羟基等新结构,导致粉体间相互吸引(如氢键间的作用力)与化学反应(如—OH基间聚合反应)等行为,是大多数纳米粉体团聚的真正原因。此外,还从原理上论述了真空状态、惰性气体保护及表面改性适合于无团聚纳米粉体的制备方法。

The paper has summarized structure and performance features of ultra fine-cemented carbides WC-Co. Starting powders of ultra fine-cemented carbides have fine grain size and high specific area, so it is oxidated easily and have high the oxygen content. In the course of deoxidization, oxygen effect on the C balance marked, which makes it important to control C content. With the size of starting powders of ultra fine-cemented carbides decreasing,the sintering temperature for alloy reaching complete...

The paper has summarized structure and performance features of ultra fine-cemented carbides WC-Co. Starting powders of ultra fine-cemented carbides have fine grain size and high specific area, so it is oxidated easily and have high the oxygen content. In the course of deoxidization, oxygen effect on the C balance marked, which makes it important to control C content. With the size of starting powders of ultra fine-cemented carbides decreasing,the sintering temperature for alloy reaching complete densification will be lower. The addition of grain grow inhibitors will make the begin shrinkage temperature low relatively and shrinkage peak broaden. Ultra fine-cemented carbides WC-Co have high strength and high hardness. At the same time, it has high coercive force, which common homogeneous cemented carbides have not.

综述了超细WC-Co硬质合金的组织与性能特征。超细硬质合金因其粉末原料细小,比表面积特别大,易氧化,含氧量高,氧在还原过程中对碳平衡产生了显著的影响,使碳含量的控制显得尤为重要。随着超细硬质合金粉末原料的细化,合金需要达到完全致密的烧结温度就越低。晶粒长大抑制剂的加入使超细硬质合金的收缩率曲线开始收缩温度相对要低,且收缩峰变宽;并且它对超细硬质合金的性能和组织产生重大的影响。超细硬质合金具有普通硬质合金难以达到的高硬度和强度,以及比同类普通硬质合金的高得多的矫顽磁力。

 
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