第590章 不改本色
笔趣阁(biquge203.com)更新快,无弹窗!
其实她并不仅仅只把台面晶体管的制造方法改进,并且,她打算再把平面的弄出来,只有平面晶体管,才能在各个领域都能应用上。
不论是作为普通的电子元件。亦或是用在国防和航天上,民用和工业上,或者是计算革命上!它永远是最重要的那个!
但是因为组织给的新任务,她没有办法亲自去参与晶体管的研究。
不过,她现在把晶体管的具体制造细节都写下来,也是另外一种参与吧!
说不定,等她再次收到晶体管消息的时候,国家就有钱给她造一个合格的超净间了呢?
保持着这个美好的想法,时珈一脑子越来越清晰。
首先是化学预提纯,也可以叫粗提纯,就是把泥巴洗成粗金属,纯度很差。
这方面时珈一第一个想到的是石英精馏柱,但是国内连拉制石英玻璃管的技术都没有,材料都那么稀缺的情况下,想做一根3到5米长的填充石英珠的精馏柱,简直是天方夜谭。
所以时珈一直接pass。
太穷了!为了省钱,她都开始怀念pxx团购了.......化学预提纯出来太差,主要是因为只经过一次简单的蒸馏。
那直接改成三次重复蒸馏法!
用实验室最常见的玻璃蒸馏装置,圆底烧瓶+蒸馏头+直形冷凝管+接收瓶,这套玻璃器皿在现在国内任何一所大学的化学系都有大量库存,成本极低。
为什么要蒸馏三遍,因为精馏柱的原理,其实就是让气体和液体在管子里不断地往上冒、冷凝掉下来、再往上冒,反复洗涤。
那同样的洗涤过程,不用洗衣机洗,用手洗,多洗几遍,加点耐心,总能把杂质降低吧!
除此之外,时珈一在这个环节上,也没有更多的办法了。
这个是锗的粗提纯,但是作为硅的,有个更简单更低成本的方法。
就是著名的西门子法,每个上过化学课的应该都记得这个方法。
这个方法是在1955年就发明出来的,但是因为国际技术封锁的原因,西门子法作为提炼高纯硅的核心技术,被严格垄断了!
时珈一不改本色,凡是西方的技术,她用的心安理得!
只有西门子法提炼的硅,才能达到她想要的纯度!
也只有硅,才能成就平面晶体管!
锗?暂时不着急……..70年代之后,才迎来它作为光学上不可替代材料的王冠!
第一步,就是把粗硅变成气体。
从矿里提取出来,纯度只有90%左右的粗硅敲碎成小颗粒,扔进一个反应罐里。
在300℃的温度下,往里面吹干燥的氯化氢气体。
粗硅就会变成了气体三氯氢硅,同时还带出了一点点铁、铝等杂质。
最后把这些气体冷却成液体,这就是粗三氯氢硅。
第二步,反复蒸馏提纯。
这招跟前面提纯锗的洗三遍一模一样!粗液体反复烧3到4次。
但是每次只收集31到33℃之间的气体,把那些沸点不一样的杂质,比如四氯化硅、铁、铝等一点点甩掉。
洗上4遍后,这液体的纯度就能飙升到5N到6N。
就这样,还没第三步呢,她就能拿到6N的纯度了!!!
时珈一兴奋地甩了甩笔,然后又继续写第三步。
把洗得极其干净的气体,混着高纯氢气,一起吹进一个1100℃的管式炉里。
在炉子里放一根细细的硅棒当地基。
气体碰到高温的硅棒,就会把纯硅吐出来,一层层裹在硅棒上。
当然,这个过程很慢,但是绝对是顶级的慢工出细活,因为它最后的纯度,能达到8N到9N!
第二个环节就是区熔提纯了。
这个方法时珈一也不打算大改,首先,目前真空腔室脱氧的方法很好,这样材料不会氧化。
据林兰英所述,原方案中,炉子抽成接近真空的状态,然后里面空气分子都没有了,自然就不怕材料被氧化,所以根本不需要再往里充任何保护气体。也就是所谓的用真空来隔绝污染。
再用硅碳棒通电发热,像烤箱一样从外面把锗棒或硅棒烤化。
硅碳棒电阻加热是国内最容易实现的加热方式,缺点是受热不均匀,热量是从外向内传导的。
在这会儿没有电脑和精密的温控仪,温度高不高,全靠大家盯着光学高温计看。
温度偏了,就用手去拧自耦变压器的旋钮。这就导致温度忽高忽低,误差极大。
并且,关于熔化的那一小段熔区怎么往前走呢?
要么是靠工人手动摇丝杠,要么是加热器不动,工人手动把整根棒子往下挪。
而人手摇的速度肯定不如机器匀速,这会导致熔区移动时快时慢,进一步影响提纯效果。
一根棒子走完一趟需要8到12个小
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