第一百五十章 火炮试产
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青州城的百姓这些日子明显感受到器械司的氛围有些凝重。
因为不知何时，守卫器械司的兵饿然多了数倍，而且个个身穿银色的全身铠甲，杀气腾腾，任何稍微接近器械司的百姓都会被立刻驱离。
而进入器械司的人员每个人都需要亮出令牌，接受盘查，曾经有人看见一个没有拿令牌的人试图混入，当场被兵毒打一顿押入了大牢。
种种不同的迹象中，很多人都在猜测这器械司中到底生了什么大事？
而这也只有萧铭心中最清楚了，此时他到了器械司门口，将骏马交给门口护卫。
他来的正是时候，器械司中陈琦正带着匠人准备将生产出来的铁水灌入铁模中。
虽说现在的青州可以生产出优质的钢材，但是不是所有钢材都能用来铸炮火炮的。
事实上在现代，直到克虏伯炮钢出现之前，火炮的铸炮无非三种材料，铜，青铜，和铁。
其中铜自然不必解释，这玩意完全是在砸钱，在采矿率十分低下的大渝国，这简直和拿黄金生产马桶差不多。
而青铜则是合金，需要不同的金属，其中少不了铅和锡，同样，目前青州缺乏这些金属，对萧铭来说也不容易实现。
所以，他只能老老实实地疡铸铁炮，虽说这种火炮有弊端，但是现代的十五世纪到十八世纪末期仍旧是火炮的主流。
毕竟相对来说任何产品追求的都是性价比，而铸铁炮显然在性价比上占有很大的优势。
“殿下，马上就可以浇筑了。”
火炮的铁耐架设在高炉旁边，只要拉开高炉上的炉门，火红的铁水就会灌入铁模中。
不过在此之前还有许多事情要准备，火炮的铸炮是个精细的活，一次失败造成的损失很大，而且也将会大量延误铸造下一门火炮的时间。
所以在浇筑火炮之前，萧铭又吩咐匠人严格按照铸造火炮的程序一步一步来。
在他的监管下，一个匠人在铁模的内表面开始涂刷细稻壳和细泥沙混合的涂料，这两样东西的准备也十分严格，稻壳碾碎成粉末，又用筛子筛了三十余次才得到均匀的粉末，而泥沙也基本如此，里面的颗粒基本上大朽同。
这是为了避免炮身上出现大小不一的孔洞，同时也是为了防止炮身和铁模粘连在一起，否则火炮和铁模到时候会一起废掉。
第一层涂料涂刷结束，匠人再次涂刷第二层涂层，这层采用的是磨成粉末状的细煤粉。
目的很简单，是为了渗碳，众所周知，铁中的含碳量越高，铁的硬度就越大，这层煤粉涂层在浇筑铁水之后会深入火炮的外层，让火炮的外壳变得坚硬，从而减少火炮的炸膛率。
这两样涂层的涂刷也十分讲究，务必要均匀仔细。
待匠人涂刷结束的时候，这时萧铭检查了一遍，让匠人把一些出现瑕疵的地方再处理一下。
接着才让匠人将铁模用铁箍箍紧。
同时一些匠人开始将铁模烘热，避免铁水在接触铁模的时候外层铁水冷却过快，影响渗碳效果。
这些工作做完之后便是萧铭让陈琦特别制作的陶芯塞入炮模中。
一般来说，生产火炮需要的使用泥芯，但是吸润世的经验，为了让火炮质量旧能提高，他决定采用陶芯。
如此一来便可以通过在陶芯中间注入实现火炮内侧的快冷却，从而提高内膛的强度。
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