A Finite Element Analysis for Improvement of Shaping Process of Complex-Shaped Large-Size Silicon Carbide Mirrors

In the gel-casting process, the proper selection of technological parameters is crucial for the final quality of a green body. In this work, the finite element method is used to investigate the mold characteristics in the gel-casting process, and the typical flow behaviors under different conditions...

Full description

Saved in:
Bibliographic Details
Published in:Materials 2021-07, Vol.14 (15), p.4136
Main Authors: Qiao, Ling, Zhu, Jingchuan, Wan, Yingnan, Cui, Congcong, Zhang, Ge
Format: Article
Language:English
Subjects:
Casting defects
Ceramics
Cost control
Design optimization
Exhaust systems
Finite element analysis
Finite element method
Gating systems
Gelcasting
Molding (process)
Molds
Optimization
Process parameters
Silicon carbide
Silicon nitride
Simulation
Stress concentration
Structural integrity
Velocity
Viscosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the gel-casting process, the proper selection of technological parameters is crucial for the final quality of a green body. In this work, the finite element method is used to investigate the mold characteristics in the gel-casting process, and the typical flow behaviors under different conditions are presented. Based on the distribution characteristics of temperature, pressure and flow field of gel polymer, the simulated results provide some possible reasons for the generation mechanisms of defects. Then, a series of simulations were performed to investigate the effect of process parameters on the molding quality of green gel-cast bodies. The results show that the decreasing loading speed can effectively reduce the number of defects and improve the molding quality. In addition, this paper presents a new technique by applying the exhaust hole to decrease the number of defects and, hence, improve structural integrity. The influence of the loading speed on the mold characteristics is well understood for the gating system with an exhaust hole, which suggests to us appropriate parameters for optimizing the molding design. This work provides a theoretical basis to explicate the generating mechanism of defects involved in the gel-casting process and acquires an optimized technique to produce a silicon carbide green body.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14154136