nodular powder

By observing microstructures , we find they may form spheroidal A,acicular A and feathery A .

组织观察发现,除形成球状A、针状A外,还形成羽毛状A。

A process for the preparation of different particles of CaC03 is intruducted, the effect of various factors on CaCO3 crystal is discussed and spherical and plate-like calcium carbonate with small partical size are obstained.

采用溶液法制备了不同晶形碳酸钙,讨论了各种因素对碳酸钙结晶的影响,并得到了粒径较小的球状和片状碳酸钙。

Ca(NO3)2·4H2O and (NH4)3PO4·3 H2O used as reagents and polyvinylpyrrolidone (PVP) as template, spherical hydroxyapatite (HA) with diameter of 30～50 nm was synthesized successfully.

3H2O为反应物,聚乙烯吡咯烷酮(PVP)为模板,成功地合成了直径为30~50nm的球状羟基磷灰石。

But the report about the synthesis of spherical nano and micro HA is few.

球状HA具有良好的离子交换性能，能吸附并回收利用地方饮用水中过量的氟离子和工业废水中的重金属离子，可以用作一种新型的环境功能矿物材料。

Effect of far field flow on the spherical crystal in the undercooled melt;

远场来流对过冷熔体中球状晶体生长的影响

It is justified by the observed results that non-metallic inclusion can act as the heterogeneous nuclei of nodular graphite in this paper.

提供了非金属夹杂物作为球状石墨非自发形核心的视觉证实。