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font-family: Verdana; font-size: 14px; line-height: 25px; background-color: rgb(255, 248, 233);">粉体材料颗粒的形状是指一个颗粒的轮廓边界或表面上各点所构成的图像。颗粒形状与物性之间存在着密切的关系，它对颗粒群的许多性质产生影响，例如，粉体的比表面、流动性、填充性、形状分离操作、表面现象、化学活性、涂料的覆盖能力、粉体层对流体的透过阻力，以及颗粒在流体中的运动阻力等。工程上，</span><a href="http://www.lszj168.com/" style="color: rgb(53, 55, 63); font-size: 14px; font-family: Verdana; line-height: 25px; background-color: rgb(255, 248, 233);"><strong>偶联剂</strong></a><span style="color: rgb(53, 55, 63); font-family: Verdana; font-size: 14px; line-height: 25px; background-color: rgb(255, 248, 233);">专业人士根据不同的使用目的，对颗粒形状有着不同的要求，例如，用做砂轮的研磨料，一方面要求有好的填充结构，另一方面还要求颗粒形状具有棱角:铸造用型砂，一方面要求强度高，另一方面则要求空隙率大，以便排气，故以球形颗粒为宜;混凝土集料则要求强度高和紧密的填充结构，故碎石以正多面体为理想形状。</span><br style="color: rgb(53, 55, 63); font-family: Verdana; font-size: 14px; line-height: 25px; background-color: rgb(255, 248, 233);" /> <span style="color: rgb(53, 55, 63); font-family: Verdana; font-size: 14px; line-height: 25px; background-color: rgb(255, 248, 233);"> 以往对实际颗粒形状所采用的一些定性的描述，例如，纤维状、针状、树技状、片状、多面体状、卵石状和球状等等，己远不能满足材料科学和工程的发展对颗粒形状定量表征的要求。因此，对各种颗粒形状需进行定量描述，描述和阐明颗粒形状及特性的参数有:形状指数、形状系数和粗糙度系数。</span></p><div class="clear"></div> </div> <div class="blank30"></div> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=337"></script> <!-- 自定义表单开始 --> <!-- 自定义表单结束 --> <script language="JavaScript"> function shutwin(){ window.close(); 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