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“黑条砖”是随着内燃烧砖而产生的一种自然外装饰砖.由于砖坯内掺入了一定数量的内燃料,砖坯在窑内焙烧时砖坯与砖坯交在处因缺乏氧气而处于还原气氛中,此处粘土中铁的氧化物被还原成FeO或Fe_3O_4,形成黑压花.河北省沧县、黄骅市一带砖厂利用这一原理改进了码烧工艺,把压花引向砖的整条面,形成规则平整的“黑条砖”(也称平焦砖),从而大大提高了砖的强度(15MPa以上)和抗冻性.用这种砖可以精工砌成各种具有独特美观图案的外装饰墙(如图1所示),坚固耐用,深受当地人民的喜爱.
“Black bar” is a kind of natural exterior brick produced with inner combustion bricks. Because a certain amount of internal fuel is mixed in the brick, when the brick is baked in the kiln, the bricks and bricks are in the place where there is a lack of oxygen. In the reducing atmosphere, the oxides of iron in the clay are reduced to FeO or Fe_3O_4 to form black embossing. The Zhuanxian and Huangpi cities in Hebei Province have used this principle to improve the code burning process and guide the embossing to the bricks. The entire surface forms a regular “black bar” (also known as flat-focus brick), which greatly improves the strength of the brick (above 15 MPa) and frost resistance. This brick can be used to build a variety of unique and beautiful appearance. The outer wall of the pattern (as shown in Figure 1) is strong and durable, and it is loved by local people.