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KDP Aqueous Solution-in-Oil Microemulsion for Ultra-Precision Chemical-Mechanical Polishing of KDP Crystal

Institute of Machinery Manufacturing Technology, China Academy of Engineering of Physics (CAEP), Mianyang 621900, China
Authors to whom correspondence should be addressed.
Academic Editor: Xu Deng
Materials 2017, 10(3), 271;
Received: 10 January 2017 / Revised: 3 March 2017 / Accepted: 6 March 2017 / Published: 9 March 2017
(This article belongs to the Section Manufacturing Processes and Systems)
A novel functional KH2PO4 (KDP) aqueous solution-in-oil (KDP aq/O) microemulsion system for KDP crystal ultra-precision chemical-mechanical polishing (CMP) was prepared. The system, which consisted of decanol, Triton X-100, and KH2PO4 aqueous solution, was available at room temperature. The functional KDP aq/O microemulsion system was systematically studied and applied as polishing solution to KDP CMP technology. In this study, a controlled deliquescent mechanism was proposed for KDP polishing with the KDP aq/O microemulsion. KDP aqueous solution, the chemical etchant in the polishing process, was caged into the micelles in the microemulsion, leading to a limitation of the reaction between the KDP crystal and KDP aqueous solution only if the microemulsion was deformed under the effect of the external force. Based on the interface reaction dynamics, KDP aqueous solutions with different concentrations (cKDP) were applied to replace water in the traditional water-in-oil (W/O) microemulsion. The practicability of the controlled deliquescent mechanism was proved by the decreasing material removal rate (MRR) with the increasing of the cKDP. As a result, the corrosion pits on the KDP surface were avoided to some degree. Moreover, the roughnesses of KDP with KDP aq/O microemulsion (cKDP was changed from 10 mM to 100 mM) as polishing solutions were smaller than that with the W/O microemulsion. The smallest surface root-mean-square roughness of 1.5 nm was obtained at a 30 mmol/L KDP aq solution, because of the most appropriate deliquescent rate and MRR. View Full-Text
Keywords: KDP crystal; chemical-mechanical polishing; water-in-oil microemulsion KDP crystal; chemical-mechanical polishing; water-in-oil microemulsion
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MDPI and ACS Style

Dong, H.; Wang, L.; Gao, W.; Li, X.; Wang, C.; Ji, F.; Pan, J.; Wang, B. KDP Aqueous Solution-in-Oil Microemulsion for Ultra-Precision Chemical-Mechanical Polishing of KDP Crystal. Materials 2017, 10, 271.

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