权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Mechanism of Ultra-fine Grinding of Ceramics Raw Materials

陶瓷原料超细粉碎机理

基本信息

批准号：
60470114
负责人：
JIMBO Genji
金额：
$ 2.5万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60470114/
关键词：
Ceramics Ultra-fine grinding grinding aid wear hydrogen generation planetary mill agitation mill stirrer mill wet vibration mill 凝集体形成ボールミル

项目摘要

Using four types of media mill, such as ball, vibration ball, planetary and stirrer mills, the possibility of producing sub-micron powder of ceramic raw materials with mechanical size reduction methods was investigated, by making clear the existence of ultimate size distribution of ground product and by finding out the factors which determine that ultimate value. Some other phenomena associated with grinding process in such a fine range were also investigated. Main findings are as follows;(1) Negative rate of grinding at final stage of fine media milling was found to be the controlling factor of ultimate size of ground product. In the case of less cohesive material such as silicate sand, the effect of mill type on negative rate did not appear clearly, but in the case of cohesive naterial such as limestone, the effect of ball type differentiated the ultimate size of product.(2) In the range of negative rate grinding, agglomerated powder was formed. This agglomerated powder was compacted to be larger in size and spparent density as grinding proceeded. And this tendency was strengthened when ball weight became larger.(3) The pulverizing mechanism of planstary mill was found to be the combination of compressive force by mass of media against mill wall and frictional and shearing effect by media mass in surging action. And as this mechanism was different from that of ball milling, the ultimate size of product shifted to finer side, for which smaller media was more effective.(4) The ultimate size of product by stirrer mill was found to be better than that by ball milling. Grinding aid may shift this value to finer side, but contrary it may cause the increase of waer.(5) The metal wear of vibration ball milling was measured and relatively simple relationship between specific surface area and specific wear was found and formulated. And it was found that hydrogen gas was produced during wet grinding with steel ball.

采用球磨机、振动球磨机、行星磨和搅拌米尔斯磨等4种介质磨，研究了机械粉碎法制备陶瓷原料亚微米粉体的可能性，明确了粉碎产物极限粒度分布的存在，并找出了决定该极限粒度分布的因素。同时还研究了在这种细磨范围内与磨削过程有关的其它一些现象。主要调查结果如下：（1）细介质磨矿末阶段的负磨矿速率是最终磨矿产物粒度的控制因素。对于粘性较小的物料，如硅酸盐砂，磨机类型对负率的影响不明显，但对于粘性较大的物料，如石灰石，磨球类型的影响使产品的最终尺寸不同。(2)在负速率范围内，粉末形成团聚体。随着研磨的进行，这种团聚的粉末被压制成更大的尺寸和表观密度。球重越大，这种趋势越明显。(3)指出了球磨机的制粉机理是物料对磨壁的压缩力和物料在振荡作用下的摩擦剪切作用的综合。由于该机理与球磨机理不同，产物的最终尺寸向更细的一侧移动，因此较小的介质对产物的最终尺寸更有效。(4)结果表明，搅拌磨的产品最终粒度优于球磨。助磨剂可使该值向细粉侧移动，但相反会使含水量增加。(5)测定了振动球磨的金属磨损量，发现并建立了比表面积与比磨损量之间的简单关系式。同时发现钢球湿磨过程中有氢气产生。