Abstract
Bonding is used widely when the optical glasses are connected with metal structures. It plays a very important role in the design of space telescope. Improper bonding may induce great surface figure error for optics in telescope. Milbond and EC2216 are the most popular epoxies that are used in optics. Bubbles usually exist in the epoxy when two components are mixed or translated to syringe. In this paper, the methods and experiments of adhesive mixture and injection in vacuum environment were explained to reduce the bonding surface figure of the mirror. The results show that adhesive mixture and injection in vacuum environment can dramatically decrease the bubble in the epoxy and greatly reduce the bonding surface figure error.
Highlights
Bonding is used widely when the optical glasses are connected with metal structures
The results show that adhesive mixture and injection in vacuum environment can dramatically decrease the bubble in the epoxy and greatly reduce the bonding surface figure error
Compared with RTV adhesive, epoxy adhesive has the advantages of high bonding strength and small linear expansion coefficient
Summary
Bonding is used widely when the optical glasses are connected with metal structures. It plays a very important role in the design of space telescope. Bonding with RTV adhesive can minimize the change of the mirror surface figure error, the bonding strength of RTV adhesive is only about 1 ~ 2 MPa [1] [2] [3]. The thickness of the adhesive layer is thicker, generally greater than 0.5 mm, and the linear expansion coefficient is more than 2 × 10−4 K−1, and the surface figure error is sensitive to changes in the temperature environment. The space mirror needs to go through the vacuum thermal alternating environment, so it is very important to control the bonding process to reduce the bubbles in the adhesive layer. The methods and experiments of adhesive mixture and injection were explained to reduce the bonding surface figure of the mirror
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