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The preparation and performance of high-temperature adhesives for graphite bonding

✍ Scribed by Jigang Wang; Quangui Guo; Lang Liu; Jinren Song

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
464 KB
Volume
25
Category
Article
ISSN
0143-7496

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✦ Synopsis

Two kinds of high-temperature adhesives (HTAs) were prepared. One was composed of phenol-formaldehyde (PF) resin and boron carbide (PF+B 4 C), the other was composed of PF resin, B 4 C and fumed silica (PF+B 4 C+SiO 2 ). Graphite materials were bonded by the above adhesives and heat-treated at temperatures ranging from 200 to 1500 1C. The joining strength was tested at room temperature. The results show that the graphite joints exhibit satisfactory bonding strength and that ceramics fillers show a marked property modification effect. The strength of graphite joints bonded by PF+B 4 C and PF+B 4 C+SiO 2 adhesive and treated at 1500 1C are 9.3 and 17.1 MPa, respectively. The property modification mechanism of ceramics fillers is also discussed in this paper. A strong chemical bonding force is introduced at the bonding interface and the volume shrinkage is restrained, which can be responsible for the good adhesive properties of HTAs for graphite bonding.

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