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第二百三十章 熔炉(2 / 2)

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青铜器靠的是铸造的工艺,而钢铁则主要依赖锻造,同样的铁碳材料对比,锻态的金属组织就是致密,晶粒就是更细,无论强度还是韧性,总是完爆铸态。

后世的液态成型铸态金属组织的办法,即使是激光、等离子抑或是电子束等高科技buff给上,也难以比肩锻造的力学性能。

虽说铁也可以铸造成铸铁,但是没有千锤百炼,从性能上做不到对青铜器的碾压,历史上汉武帝时代搞出百炼钢以后,青铜武器才算彻底离开历史的舞台。

炼铁的温度源源高于炼铜,熔炉可不能再刨个坑了事,而是修得愈高越好。

公子卬开启的是在青铜时代,土法冶炼高品质钢铁的副本,要保证熔炉不坍圮,第一步粘土的加工就很重要。

他遴选纯净的粘土,用木筛子筛去小石头,再用河水浸泡,打浆成泥,混入秋天的碎草,尔后反复捶打、揉搓,直至质地均匀,最后搓成细条,备用。

纯净的粘土和浸泡是为了让熔炉工作过程中,各处受热均匀;而揉入的碎草在熔炉烧制的过程中,因为碳被烧尽,而形成微孔。熔炉会因为温度的大幅度改变而热胀冷缩,而这些微孔则增强了熔炉的抗胀缩性能,足以避免熔炉的开裂和崩塌。

下一步就是制造炉坯。公子卬写写画画,规划好各种材料堆放的位置,然后在熔炉预建的位置处下挖一个圆形的浅坑,夯实基础,然后用粘土细条一圈一圈围出炉壁的外形,用刀把内外壁面仔细抹平,不留缝隙。

辛苦了一个时辰后,他在底部侧面,用锉刀捅开口子,留给鼓风和出渣,这样炉坯才算大功告成。接下来的时间,就交给太阳公公,晒干炉坯。

这段等候的时间里,公子卬开始鼓捣鼓风设备,用刚竹搭建可以往复式运动的扇叶,然后用木料、绳索固定在密闭的土坯中,只留一个进气的活门和一个通往熔炉的出气口。

到了西边挂上火红的云彩,炉坯的曝晒也够时间了。

公子卬在里面填上木炭,点燃,烧结。炉坯就仿佛制陶一样,被加热成坚硬的炉壁,在烧结的时候,有两处壁面有裂开的迹象,公子卬及时修补。等烧结完迄,炼铁的熔炉就算建成了。

“这次,我只是给二三子试制一个炼铁熔炉,等以后铁矿的产量变大,就需要诸位根据需要自行修建更大的熔炉,如果肯花功夫投入一个月的时间修建高炉的话,这么大的炉子一次可以冶炼三百五十石(约两千多斤)的铁矿石。”

锜人递上帕布,公子卬在额头上抹了一把,斗大的汗水和着泥土被揩了下来。

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