Binders binder removal

Binder removal can be accomplished by thermal decomposition or by dissolutiion. In ceramics, the thermal decomposition method is commonly used and will be considered here. The process is referred to as thermal debinding or, more simply, as binder burnout. In thermal debinding of ceramic green bodies, both chemical and physical factors are important. Chemically, composition of the binder determines the decomposition temperature and the decomposition products. Physically, the removal of the binder is controlled by heat transfer into the body and mass transport of the decomposition products out of the body. 

Thermal degradation, as outlined above, leads to production of volatile, low molecular weight products throughout the binder phase and the removal of the binder by evaporation of a liquid. Binder removal by this mechanism m.ay be quite similar to the drying of a moist granular material considered above (17.2.3.3.1). Considerable redistribution of the liquid occurs, and the evaporation front does not move uniformaly into the bodyT Instead, pore channels first develop deep in the body as liquid from the larger pores is drawn into the smaller pores. 

One solution of the conflict might involve the use of a sintering aid to enhance densification during firing. Table 1 also indicates that a low ambient pressure or a vacuum serves to reduce the time for binder removal. A vacuum, however, does not lead to oxidative degradation. Furthermore, temperature control and transport of heat are... 

Pellet pressing Binder removal 138-207 MPa, 53% theoretical density green density... 

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