无铅的

The sample of nonleaded freeutting brass containing silicon is observed with electron microscope, we find that there is a clearance in the boundary between basal part?P phase and second phase particle?

将合硅的无铅易切削黄铜试样置于电子显微镜下观察，发现第二相质点γ相与基体β相的交界处有一间隙，说明基体与第二相质点间并未紧密结合。

Y phase. This indicate that basal part is not combine with second phase particle tightly, just equal to y phase inlaying P phase?s countless holes, this is the principle of the cutability of nonleaded freeutting brass.

可以认为，基体β相中存在着无数微小孔洞，孔洞中又存在一个体积稍小一点的γ相微粒，当车刀碰到γ相时，切屑自动折断，这是无铅易切削黄铜的切削原理所在。

Development and application of lead-free piezoelectric ceramics have become the concern of scientists in many countries.

无铅压电陶瓷的开发和应用已经成为各个国家的研究热点。

The preparation method of lead-free piezoelectric ceramic is the key factor to determine its structure,character and application.

无铅压电陶瓷的制备方法是决定其结构、性质和应用的关键因素。

So it has important economic and social meaning to study lead-free solders with self-determined property right, good performance, low costs.

所以研究具有自主知识产权、性能优、成本低的无铅钎料具有重大的经济和社会意义。

The experimental results show that the melting point of Sn-3Ag-1.5Sb-xCu solder decreases with Cu addition and the solder with 1.0 wt-%Cu is a narrower mushy range between solidus and liquidus.

本研究在探讨对Sn-3Ag-1.5Sb无铅焊料中添加0~1.5wt_%Cu对其焊点於焊接后与高温热储存后的微观组织及拉伸强度的影响。

A Fuel: Unleaded commercial quality gasoline from tank station, max.

加油站的商用质量的无铅汽油，最高98辛烷值。

Thus the production of high-quality, high-grade cars using unleaded petrol refinery is the one of the urgent tasks.

因此生产高质量、高标号的车用无铅汽油是各炼油厂的紧迫任务之一。

In conclusion , a kind of innoxious lead-free solder with better wettability , good mechanical properties and low costs is obtained finally, by alloying method which can improve the properties of the soldering alloy.

总之，通过合金化的方法来改善无铅钎料合金的性能，最终得到一种无毒

Surface treatment process are: HAL, the entire plate electroless nickel gold, Gold Finger, lead-free HASL, chemical plated / silver / tin, Anti-oxidation treatment and so on, there is conductive in accordance with the requirements of customers Cypriot hole, peelable plastic, conductive plastic and a variety of models and the photosensitive ink color.

表面处理工艺有：热风整、全板电镀镍金、金手指、无铅喷锡、化学镀金／银／锡、防氧化处理等，有根据客户要求的导电塞孔、可剥胶、导电胶和各种型号及颜色的感光油墨。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。