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多年来,我们采用的制壳工艺:高模数水玻璃为粘结剂,石英粉配制成的耐火涂料,撒砂材料为不同粒度的石英砂,化学硬化剂为氯化铵;硬化及风干时间分别为15分钟和20分钟。 采用上述的制壳工艺,生产出的型壳常温及高温强度低、型壳易变形,浇注时出现大量跑火。且生产周期长、效率低。 后来我们用高铝质耐火砖份取代石英粉来配制加固涂料,该涂料工艺性能较稳定,硬化时渗透性能较好,涂制出型壳的常温和高
Over the years, we use the shell process: high modulus water glass as a binder, quartz powder with refractory paint, sand material for the different sizes of quartz sand, chemical hardening agent for the ammonium chloride; hardening and drying time Respectively 15 minutes and 20 minutes. Using the above shell making process, the produced shell has low strength at normal temperature and high temperature, the shell is easy to deform, and a large amount of running fire occurs when pouring. And long production cycle, low efficiency. Later, we replaced the quartz powder with high aluminum refractory brick to prepare the reinforced coating. The coating has relatively stable process performance and good permeability when hardened.