查询词典 preforms

The densification rate of the surface layer of the preforms was the most fast.

在轧制过程中，轧件上表面的致密化速度最快。

X-ray radiography, X-ray radioscopy and X-ray computed tomography were performed to the C preforms and C/SiC composites made by chemical vapor infiltration method. Elementary research of the simulation of X-ray nondestructive testing of C preforms and C/SiC composites was conducted. The main contents and conclusions are summarized as follows:(1) The equivalent absorption coefficients of graphite and SiC to Al (KAl/sic, KAI/C) were measured. It was found that in 35-45KV, KAl/sic=1.1~1.2 and KAl/c=0.08~0.12. That means X-ray radiography was much less sensitive to fiber defects than to SiC matrix. It was suggested that Al Image Quality Indicator would be used to evaluate the quality of X-ray radiographs of C/SiC.

本文选择X射线照相、X射线实时成像和X射线CT等三种方法对C纤维预制体及C／SiC复合材料进行了检测和研究，并对C／SiC复合材料X射线检测的计算机模拟做了初步的探索，主要研究内容和结果如下：(1)测定了C和SiC的X射线照相等效系数，在35～45KV的条件下，Al对SiC的等效系数K_为1.1～1.2，Al对C的等效系数K_为0.08～0.12，所以X照相射线检测C／SiC对C纤维缺陷不敏感，而对SiC基体缺陷敏感。

The conclusions can be drawn as the following:(1) According to the theoretical calculation, the porous C/C preforms with uniform pores radius from 10 μ m to 1300 μ m are beneficial to infiltration of liquid silicon. The growth of SiC was controlled by the self-diffusion of carbon atoms.

研究结果表明：(1)根据理论计算可知，在10μm～1300μm的孔径范围内，具有均一孔径的多孔体有利于液Si的渗入，SiC的生长为C原子的自扩散控制。

System is used to sterilize the PET preforms instead of the bottles.

系统是用来消毒的PET瓶坯，而不是瓶。

Resultingly limitation of equipment, it is difficult to densify the spray deposited preforms with large dimension by extrusion.

而采用挤压等工艺，由于受到设备的限制，无法实现大尺寸坯料的变形。

ZnO, MgO and SiO_2 powders were covered on top of the alloy as dopants, the effects and principles of the dopants were discussed. Based these, SiC particles were made into preforms with different distribution of air holes by changing the granularity of SiC particles and the content of graphite additive, and the oxidation growth of aluminum alloy melt into the air holes within the preform was controlled to prepare SiC/Al_2O_3/Al composite with inerratic shape. And the SiC particles effect principle to the oxidation of SiC/Al2O3/Al composite was studied.

以ZnO，MgO和SiO_2为引发剂，覆盖在合金表面，讨论了引发剂的添加效果和作用机理；在此基础上将α-SiC颗粒制作成为预制体，通过改变SiC的粒度和石墨造孔剂的含量，调整预制体内部的气孔分布，控制铝合金熔体在预制体孔隙内的氧化生长，制备出形状规则的SiC/Al2O3/Al复合材料，同时研究了SiC颗粒的存在对SiC/Al_2O_3/Al复合材料生长机理的影响。

Ancillary tooling was used to premold the kitted layups into net-shape preforms, which then were placed in the RTM tool and held in precise position by the various steel tool details.

辅助性模具则用来将成套的接头与终型预成型件结合在一起，然后将其放在树脂传递模塑成型的模具上，并通过各种金属模具零部件固定在准确的位置上。

The low temperature sintering mechanism of SiC preforms and the effect of Graphite content on the density and dimension of the porous preforms were studied.

研究了SiC多孔陶瓷的低温氧化烧结机理和石墨添加量对SiC陶瓷骨架烧结密度和尺寸变化的影响。

According to shapes of spray deposited preforms, different densification technologies of preforms with large dimension and sheets were investigated respectively.

本文针对不同形状的喷射沉积坯料，对大尺寸喷射沉积坯料和喷射沉积板坯的致密化技术分别进行了研究。

There are even injection moulding machines dedicated to making preforms having a rectangular tiebar clearance to fit the needs of making preforms.

有瓶坯专用的注塑机采用长型的四柱空间迎合瓶坯模具的需要。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。