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Baoqun Ning,Yong Nie,Qian Wang,Yu Fu,Yue Li,Jian Han,Yingfeng Shao,Jiuchun Yan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
This paper introduced a method of rapid solid-phase bonding Al block with Ag as the intermediate layer by longitudinalultrasonic vibration under eutectic temperature in the atmospheric environment. This method is suitable for the application ofstructural lightweight design. It was observed that Al and Ag difuse with each other in the weld seam to form an intermetallic compound Ag2Al with close hexagonal structure. The efects of diferent reaction temperatures and ultrasonic vibrationtimes on the microstructure and mechanical properties of intermetallic compound Ag2Al were discussed. The infuence ofthe efect of ultrasonic softening waves on surface oxide flm rupture and element difusion was explored. With the increaseof ultrasonic vibration time, the intermetallic compounds grew along with the interface and the thickness increased. Whenthe welding temperature was 500 °C and the ultrasonic vibration was 20 s, the highest average strength of the welded jointreaches 46.68 MPa.
The solvent-free modification of butyl rubber in the medium of NaH
Ying Feng,Yan Xia Wang,Hong Qi Shao,En Hua Zhang,Zhen Wang,Jiruo Zhao 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
A novel improved butyl rubber (PMIIR) was prepared in a solvent free process, using sodium hydride(NaH) as activating agent and maleic anhydride (MAH) as modifier by processing modificationtechnology in a conventional polymer processing equipment of an internal mixer. The structure ofproducts was characterized by 1H NMR and FT-IR. In this process, polar sodium carboxylate functionalgroup and unsaturated carbon–carbon double bonds were successfully introduced onto the chains of IIRon one step. The reaction mechanism was investigated in detail. It was found that the functionalizationexperienced two modified mechanisms: addition and substitution modified mechanisms. The reactionefficiency and content of MAH were evaluated. Polymer isolation and purification operations werereduced out due to the result of solvent free. Curing and mechanical properties of products wereinvestigated. It was found that PMIIR has greatly increased curing rate due to the incorporation of polargroup and carbon–carbon double bond.