spherical grain

We hold that pearl's formation involves fore phases: the formation of calcium carbonate gel and the formation of calcium carbonate spherical grain, and the transformation of mineral and subsequent growth.

本文将珍珠的形成过程初步归纳为碳酸钙凝胶的形成，碳酸钙球粒的形成，矿物相的转变和后继生长四个阶段。

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During the deposition of nanocrystalline silicon carbide films, with the increase of tetramethylsilane concentration in the reactive gas source, the crystal structure of silicon carbide whose grain size decreases changes from hexagonal to cubic and the particle shape changes from spherical to cauliflower-like.

在制备纳米碳化硅薄膜的沉积过程中，随着四甲基硅烷浓度的增大，纳米碳化硅晶体结构由六方转变为立方结构，颗粒形状由球状变为菜花状。

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Fine and uniform cementite with spherical appearance distribute on the crystal boundary of equiaxed ferrite crystals. The size of spherical cementite particle is about 1 μ m and the size of ferrite grain is about 3 μ m.

在本实验条件下，细小、圆形的渗碳体均匀的分布在铁素体等轴晶粒的晶界处，球状渗碳体颗粒大小约为1μm，铁素体的平均晶粒大小约为3μm；

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The results show that after process of supercritical fluid drying at 260 ℃ × 7.5 MPa × 0.5 h, ZAO powders are obtained with size less than 20 nm, high surface area and better spherical grain.

结果表明：在260℃×7.5MPa×0.5h的超临界流体条件下，得到平均粒度小于20nm，高的比表面积，近球形的ZAO粉体。

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Spherical grain shape, grain size is uniform, moderate density, almost no aggregation.

晶粒形状为球状，晶粒粒度很均匀，密度适中，几乎没有团聚现象。

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Utilizing filling structure theory of average spherical grain to calculate the bulk proportion of different granularity medium and utilizing the most dense filling theory to calculate the granularity proportion, author worked out the optimized grinding medium proportion of annular gap mill.

首先利用均一球形颗粒填充结构理论计算了介质球不同粒径的体积配比，利用最密填充理论计算了介质球的粒径大小的配比，求出了环缝磨研磨介质的优化配比。

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During manufacturing semisolid Al-Mg based alloy by rheocasting of incline cooling and shearing, melt alloy heterogeneously nucleated on the incline-cooling plate surface and was sheared under the gravity force, and alloy microstructure gradually evolves from big net-work composed of equiaxed dendrites to small spherical grain.

倾斜式冷却剪切流变制备半固态Al Mg合金过程中，合金在冷却板表面非均匀形核，并受到重力的剪切作用，合金组织逐渐从粗大等轴晶网络演化为细小的球形晶；

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While the isothermal treating temperature raised to 850 ℃, the boride, to form BN instead, precipitates out around the spherical MnS grain as nucleus of crystallization to obtain a compound of MnS+ BN.

在850℃恒温处理时BN以MrS为结晶核心在其周围析出，呈MnS+BN复合体形态。

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