固晶

基于DSP的固晶机伺服控制器的研究

Study of Die Bonder Servo Controller Based on DSP

通过改变荧光粉层粉体的粒度、厚度、形状、固晶位置等参数，可以改变白光LED的光效、颜色参数和空间光强分布。

Not only White-LED 's efficiency , but also its color and light distribution will be affected by changing phosphor 's granularity , thickness and size .

LED固晶机是LED产业中关键的封装设备之一，固晶过程的效率和质量是衡量其性能主要的参数。

LED die-bonder is one of the packaging equipment for the LED industry , the process efficiency and quality is a measure of its performance parameters .

固晶材料是最重要的LED器件封装材料之一，其热物理性能参数和几何尺寸对封装的总热阻具有较大的影响。

Die-attach material is the most important one of all the LED packaging materials , its thermal physical properties and geometric dimensions have a great effect on the total thermal resistance of the package .

为了确定不同封装材料对白光LED光衰等性能指标影响的程度，进行了不同材料支架、不同种类固晶胶，以及不同厂家荧光粉及配粉胶的对比试验。

Some packing materials have been tested contrastively including different brackets , glues for fixing chips , fluorescent powder and glues for mixing fluorescent powder , in order to confirm their influence on luminous decay performance of white LED .

使用银浆固晶比用环氧树脂寿命长，但初始光通比环氧树脂低近1／3；

The life of white LED using silver glues is longer than using epoxy resins , but initial luminous flux is much lower by1 / 3 .

本机械结构较之现有技术，大大提高了取晶固晶的效率，设置适当的参数，可获得很高的精度。

Compared with the prior art , the mechanical structure greatly enhances the efficiency of the die taking and the die bonding , and can obtain very high precision by setting appropriate parameters .

在半导体封装产业中，固晶机的吸晶装置起到非常重要的作用，如何实现吸晶工艺稳定、高质量保证和高效率协同是一个重要课题。

In semiconductor packaging industries , the pick-up process of die bonder is very important , how to realize the high stability , high quality and efficient coordination of pick-up process parameters is an important subject .

EDX、选区电子衍射确定第二结晶相为MgAl2O4尖晶石，观察确定第二结晶相以固溶共晶、固溶包晶存在；其形态多为圆粒状。

The secondary crystalline phase is determined as spinel ( MgAl_2O_4 ) by EDX and selected area electron diffraction . It is observed that the secondary crystalline phase is a circular granular polyhedron and exists as paragenetic solid solution or peritectic solid solution .

试验结果表明，铸态时镁铈、镁钕中间相（Mg-Ce、Mg-Nd相）主要以共晶形式分布在合金的晶界，稀土钇（Y）则部分固溶于晶内；

The results show that the intermediate phases Mg-Ce and Mg-Nd in eutectic is mainly distributed in grain boundary of the tested alloys , however the rare earth yttrium is partly solved in the intracrystal .

结果表明：稀土除可与氧、硫、硼等反应外，还可固溶于晶内、晶界或晶界附近；

The rare earth in the coatings can react with oxygen , sulfur and boron , and dissolved in the grains or grain boundaries .

离子束辅助沉积引发互不固溶系非晶相和亚稳晶相形成

Amorphous and metastable crystalline phases formed by ion beam assisted deposition in immiscible systems

结果表明：不同钎焊工艺参数下的钎缝均由钴基固溶体、碳化物M23C6、硼化物M3B2+钴基固溶体共晶，以及块状及颗粒状碳化物MC组成。

The results showed that joints , with similar compositions , were made up with cobalt-based solution , M23C6 , eutectics of M3B2 + cobalt-based solution and small block of MC .