Partition gelation casting in RB-SiC mirror billet

ZHAO Ru-cheng; BAO Jian-xun; CAO Qi; CUI Cong-cong; DONG Bin-chao; ZHANG Ge

doi:10.3788/OPE.20172514.0111

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Partition gelation casting in RB-SiC mirror billet

更新时间：2020-08-13

- Partition gelation casting in RB-SiC mirror billet
- Optics and Precision Engineering Vol. 25, Issue 12z, Pages: 111-116(2017)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所中国科学院光学系统先进制造技术重点实验室,吉林长春,130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172514.0111
  CLC： TP703
- Received：20 August 2017，
  
  Revised：06 September 2017，
  
  Published：31 December 2017
- 稿件说明：
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赵汝成, 包建勋, 曹琪等. 碳化硅反射镜镜坯分区浇注成型技术[J]. 光学精密工程, 2017,25(12z): 111-116

ZHAO Ru-cheng, BAO Jian-xun, CAO Qi etc. Partition gelation casting in RB-SiC mirror billet[J]. Editorial Office of Optics and Precision Engineering, 2017,25(12z): 111-116
赵汝成, 包建勋, 曹琪等. 碳化硅反射镜镜坯分区浇注成型技术[J]. 光学精密工程, 2017,25(12z): 111-116 DOI： 10.3788/OPE.20172514.0111.

ZHAO Ru-cheng, BAO Jian-xun, CAO Qi etc. Partition gelation casting in RB-SiC mirror billet[J]. Editorial Office of Optics and Precision Engineering, 2017,25(12z): 111-116 DOI： 10.3788/OPE.20172514.0111.

摘要

针对镜坯分区浇注区域内交接缝的连接方式与表面处理，提出了一种分区浇注成型的技术方案，来实现大口径SiC反射镜镜坯成型；采用凝胶注模（Gel-casting）成型结合反应烧结SiC（RB-SiC）技术，对

500 mm镜坯进行了分区浇注成型的研究，对模具分割的合理性，干燥后镜坯交接缝的物理性能及反应烧结后镜坯的镜面性能分别进行了验证。试验结果表明：该工艺的可行性好，干燥成型后的镜坯强度较大；经1 700℃高温烧结得到的碳化硅镜坯，整体收缩一致，收缩率

1.2%，镜坯的密度≥3.0 g/cm

，微观结构分析可知：镜坯交接缝无界面存在且碳化硅反射镜镜坯的制备质量符合空间光学系统设计的要求。

Abstract

A method for partition casting molding to realize mirror billet molding for SiC mirror was introduced in the Thesis; aimed at joining method and surface treatment for handover seam in partition casting area of mirror billet

one kind of scientific and reasonable technology scheme was proposed;

500 mm mirror billet was provided with research of partition casting molding by taking advantage of Gel-casting (Gel-casting) molding combined with reactive sintering SiC (RB-SiC) technology in the Thesis. The experiment result shows that this process is very feasible

and mirror billet strength after dry molding is relatively large; in case of SiC mirror billet obtained through 1 700℃ high-temperature sintering

whole contraction is consistent

and shrinkage factor is less than 1.2%. Density of mirror billet is not less than 3.0 g/㎝

and it can be known form micro-structure analysis that:There are no interfaces between handover seam of mirror billet; preparing quality for mirror billet of SiC mirror conforms to requirements of spatial optical system design.

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Keywords

references

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