1, the drying process of four stages: the stage of heating, drying period and falling rate drying stage, balance drying stage
2. The main physical and chemical changes in the liquid phase were briefly introduced.
Low
temperature stage: the discharge of water to reduce the quality,
leaving the porosity increases, the particles closer to the volume
shrinkage. In the middle temperature stage, the chemical changes: the
oxidation reaction, the decomposition reaction, the crystal form
transformation, the production of a small amount of liquid phase.
Physical changes: the structure of water and the decomposition of gas,
the body mass decreased, density increased, according to the formula of
clay, quartz content of the number of different degrees of change in
volume. High temperature oxidation stage: 1) insulation stage (2)
generation of glass phase (3) what are the formation of mullite, 3
factors influencing sintering?
Low temperature preheating stage,
middle temperature stage, high temperature stage, high temperature
thermal insulation stage, cooling stage
1、干燥过程四个阶段:加热阶段、等速干燥阶段、降速干燥阶段、平衡干燥阶段
2、简述液相烧成各阶段所发生的主要物理化学变化。低温阶段:排出水分使质量减轻、留下气孔使气孔率增加、颗粒紧密靠拢使体积收缩。
中温阶段:化学变化:氧化反应、分解反应、晶型转变、少量液相的生成。
物理变化:结构水和分解气体排除,坯体质量减小,密度增加,根据配方中粘土、石英含量的多少发生不同程度的体积变化。
高温阶段:
1)氧化保温阶段
2)生成玻璃相
3)生成莫来石
3、影响烧结的因素有哪些?
低温预热阶段、中温阶段、高温阶段、高温保温阶段、冷却阶段
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