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(continuously last article ) 4. Compounding Mixing qualified manufactured raw material proportionally, adding binder and making preperation for molding of biscuit. 5. Molding Biscuit Machining Biscuit into certian shape. With the developement of molding technology, more and more molding method are invented. Compression molding is the most common technique. No matter what mloding method are applied, the final product should comply with following requirement: the size, shape, and precision of product should be manchined as designed. And then, final product should be high in density, uniform in structure, stratification, low in porosity, outstanding mechanical strength. By the way, chemical- physical property also should be qualified. 6. Drying Shaped biscuit neet to dry for a while in the air, then by…
According to different application of carbon and graphite product, diiferent physical-chemical standard indicators were stipulated to evaluate quality. Physical-chemical indicators of product is concerned not only with that of raw material, but also with manufacturing technology.There are some rules existing between raw material and manufacturing technology. If we want to keep product be qualified, we should ensure raw material is qualified, manufacturing technology is responsible. This article focus on introducing main physical-chemical indicators. There are six main indicators. 1. True density True density means the weight of per unit volume of material excluding proportion,who is measured by g/cm³.Usually，we smash assay into 0.15mm, infiltrate assay with alcohol or distilled water, and weight the handled material via comparison weighing method. By testing…
Manufaturing technique of refractory products is similar with that of common graphtie prodcut. The basic process are as follows: Selecting Raw Material → Heating Raw Material → Smashing → Compounding → Molding Biscuit → Drying →Presintering Biscuit →Rough Machining →Sintering → Final Machining → Inspecting→ Finished Product. 1. Selecting Raw Material When peolple are selecting raw material, they should take application into consideration. Most raw material is chemical material, only a few raw material is raw mineral materials. Usually, we can get raw material from market. And some special raw material should be compound by people themselves. In general，the purity of raw material is very high. For example, when people produce magnesia carbon brick, content of magnesium oxide should exceed…
