Optimal Heating Strategies of Polymer Binder Burnout Process Using Dynamic Optimization Scheme

Abstract

The dynamic optimization of polymer binder burnout processes was evaluated for a 3D cubic ceramic body in different sample porosities and atmospheres. Optimal heating trajectories of the binder removal processes to minimize the burnout time were estimated by the proposed algorithm. The process model can be constructed by the chemical kinetics of the polymer burnout and the mass transport of the volatile gas evolved from polymer burnout inside the ceramic body. A numerical simulation was used to calculate the buildup pressure distribution formed by the volatile gas which affects the generation of the ceramic defects. The results show that the maximum pressure was found at the body center through the binder burnout period. The process needs to be well-controlled to avoid the formation of a large buildup pressure, especially for the samples with small porosities, during the initial binder burnout stages. In addition, the effects of the operating atmospheres and the sample porosities on the optimal heating trajectories were discussed.

Kinetic investigation of ZrO2, Y2O3, and Ni on poly(vinyl butyral) thermal degradation using nonlinear heating functions

“…2 Recent studies were focused on controlling the formation rate of the evolved gas (kinetics) with respect to the adopted heating strategy to avoid the forming of the pressure buildup inside ceramic components. 3,4 The main theories of the pressure buildup to form the defects were proposed and focused on the kinetics of the evolving gas and the gas transport out of the ceramic body. Therefore, the fundamental knowledge of the degradation kinetics of binder removal corresponding to heating conditions has to be understood well to avoid the inappropriate operation.…”

Optimal Control of the Sintering Strain Rate of Yttria-Stabilized Zirconia Electrolytes for Solid Oxide Fuel Cells Using a Thermal−Mechanical Analyzer during the Sintering Process

“…2 Recent studies focused on the control of the formation rate of the evolved gas (kinetics) with respect to the adopted heating strategy to avoid the formation of pressure buildup inside ceramic components. [3][4][5][6][7][8] After the binder burnout step, a sintering process was carried out for ceramic densification in the following fabrication step. Many researchers reported different sintering approaches for densification and characterization of various ceramic samples.…”

“…Defects could be generated inside the tapes due to the large buildup pressure formation . Recent studies focused on the control of the formation rate of the evolved gas (kinetics) with respect to the adopted heating strategy to avoid the formation of pressure buildup inside ceramic components. − …”

Kinetic Investigation of Photocatalytic Effects on Poly(vinyl butyral) Photodegradation

“…One of the reasons for the generation of the defects is generated by the pressure buildup of the species during the process . Therefore, the research on this topic was focused on the kinetics and the control strategies of the polymer binder degradation. − Besides, the thermal energy consumed in the binder burnout process can be a large part of the operating cost from an economic viewpoint. In addition to the thermal debinding algorithm, several binder removal methods were developed and proposed, such as solvent extraction 1 and supercritical fluid extraction …”