Novel magneto-rheological finishing process of KDP crystal by controlling fluid-crystal temperature difference to restrain deliquescence

Yin, Yilong; Zhang, Yifan; Dai, Yifan; Qu, Xiao; Tie, Guipeng

doi:10.1016/j.cirp.2018.04.058

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…The corresponding EDS result is shown in Fig. 9 c reveals that K, P, O elements uniformly distribute in the detection zone without any segregation, partly indicating that deliquescence of KDP crystal is primarily a physical process instead of chemical reactions [20, 28].…”

Section: Resultsmentioning

confidence: 99%

Preliminary investigation of the effect of environmental humidity on the nanoscale mechanical removal of KDP crystal

Zhou

Jiang

Liu

et al. 2019

Micro & Nano Letters

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In this paper, the effect of environmental humidity on the mechanical removal of potassium dihydrogen phosphate (KDP) crystal was preliminarily investigated using an environment control atomic force microscope at the nanoscale. The results reveal that the pre-wear storage time in humid environments has nearly no impact on the removal of KDP crystal with ∼50 nm wear depth whereas the post-wear storage time imposes remarkable influence. Moreover, the material removal volume gradually increases from 29 × 10 5 to 127 × 10 5 nm 3 when the relative humidity (RH) increases from 0 to 60%. Such significant increment is mainly attributed to the synergism of mechanical force and deliquescence. More specifically, mechanical force-enhanced deliquescence is achieved by the acceleration of the deliquescence rate in the plastic deformation zone probably due to the high concentrations of catalytically active sites for water molecules adsorption; deliquescence-enhanced mechanical force is achieved by the formation of a thin deliquescence layer with much reduced mechanical strength and the resultant promotion of the material removal. With the increase of RH, more water molecules will be adsorbed on the KDP crystal surface, leading to the continuous mutual promotion between mechanical force and deliquescence, and thereby the material removal volume greatly increases in a high RH environment.

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Section: Resultsmentioning

confidence: 99%

Preliminary investigation of the effect of environmental humidity on the nanoscale mechanical removal of KDP crystal

Zhou

Jiang

Liu

et al. 2019

Micro & Nano Letters

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“…The mainstream ultra-precision machining methods for KDP crystals can be classified into ultra-precision abrasive machining and ultra-precision diamond cutting [9]. To tackle the surface deliquescence and abrasive inlaying problems in traditional abrasive machining, the newly developed magnetorheological finishing and non-corrosive particle jet polishing have been recently proposed to realize accurate anti-wetting threshold control and the dissolved material removal of KDP crystals [10,11]. Nevertheless, the intrinsic low material Machines 2023, 11, 961 2 of 13 removal efficiency and inflexibility of abrasive machining processes remain to be resolved, particularly for the machining of large-sized KDP crystals [12].…”

Section: Introductionmentioning

confidence: 99%

On a Novel Modulation Cutting Process for Potassium Dihydrogen Phosphate with an Increased Brittle–Ductile Transition Cutting Depth

Yang,

Chen,

Zhao

2023

Machines

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Potassium dihydrogen phosphate (KDP) has garnered considerable attention due to its diverse applications across various scientific and engineering domains. Although promising machining performance enhancements have been achieved in ultra-precision diamond cutting, the brittle–ductile transition (BDT) depth for KDP crystals is essentially at the nanometer range and limits the further improvement of machining efficiency. In this paper, a novel ultra-precision diamond cutting process based on tool trapezoidal modulation is proposed for the first time to investigate the BDT characteristics of KDP crystals. By intentionally designing the tool modulation locus, the uncut chip thickness and cutting direction in the cutting duty cycle are kept constant, which provides a new strategy for probing the BDT mechanism and enhancing the machining performance. The BDT depth is significantly increased compared to the conventional ultra-precision diamond cutting owing to its unique modulation machining advantages. The significance of this paper lies not only in the improvement of the machining efficiency of KDP crystals through the proposed modulation cutting process, but also in the possibility of extending the relevant research methods and conclusions to the machining performance enhancement of other brittle optical crystals.

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“…Qu et al [13,14] successfully applied an ultra-precision grinding method to obtain ultra-smooth KDP crystal surfaces. Yin et al [15] developed a magnetorheological polishing technique with controlled fluid-crystal temperature difference to improve the polishing quality and efficiency. Shi et al [16] developed a combined magnetorheological and ion beam polishing treatment to be applied on the surface after fly-cutting.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wetting Characteristics of Polishing Fluid on the Quality of Water-Dissolution Polishing of KDP Crystals

et al. 2022

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KDP crystals constitute the only laser-frequency conversion and electro-optical switches that can be used in laser systems for inertial confinement fusion. However, KDP crystals are difficult to produce because of their inherent softness, brittleness, water-solubility, and temperature sensitivity. The authors’ group developed a water-dissolution polishing method in previous studies to obtain near-damage-free KDP surfaces. In this article, the effect of the wetting characteristics of the water dissolution polishing fluid on the crystal surface—a factor rarely considered in the usual process optimization—on the polished surface quality was comprehensively studied. The mean radius of micro water droplets at 5 wt.% and 7.5 wt.% water content was approximately 0.6 nm and 1.2 nm, respectively. Theoretically, the smaller micro water droplet size is beneficial to the polished surface quality. When the water content was 5 wt.%, due to the poor wetting characteristics of the polishing fluid, surface scratches appeared on the polished surface; when the water content was 7.5 wt.%, the effects of the wetting characteristics and the radius of the micro water droplets reached a balance, and the polished surface quality was the best (Ra 1.260 nm). These results confirm that the wetting characteristics of the polishing fluid constitute one of the key factors that must be considered. This study proves that the wetting characteristics of the polishing fluid should be improved during the optimization process of polishing fluid composition when using oil-based polishing fluids for ultra-precision polishing.

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Novel magneto-rheological finishing process of KDP crystal by controlling fluid-crystal temperature difference to restrain deliquescence

Cited by 9 publications

References 5 publications

Preliminary investigation of the effect of environmental humidity on the nanoscale mechanical removal of KDP crystal

Preliminary investigation of the effect of environmental humidity on the nanoscale mechanical removal of KDP crystal

On a Novel Modulation Cutting Process for Potassium Dihydrogen Phosphate with an Increased Brittle–Ductile Transition Cutting Depth

Effect of Wetting Characteristics of Polishing Fluid on the Quality of Water-Dissolution Polishing of KDP Crystals

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