Research progress on ultra-precision machining technologies for soft-brittle crystal materials

Gao, Hang; Wang, Xu; Guo, Dongming; Chen, Yu-Chuan

doi:10.1007/s11465-017-0411-8

Cited by 13 publications

(9 citation statements)

References 53 publications

(56 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, grinding is one of the most important material processing technologies for realizing precision and ultra-precision machining (Gao et al 2017). The primary motivations of grinding are both to realize material removal and obtain a good surface finish.…”

Section: Processing Techniques For Machining Hard and Brittle Materialsmentioning

confidence: 99%

Processing Techniques of Critical Components

Chen

2020

Precision Manufacturing

View full text Add to dashboard Cite

Critical components with complex structure (such as ultra-precision roller, reflective lenses, and engine blade) are the key element for advanced devices or equipment (roller machine, space telescope and engine, etc.), and they have high requirement for processing accuracy. With the increasing demand for components with complex and microsized structures, how to choose relevant processing techniques is becoming an essential task to fabricate those parts with a closed tolerance. In this chapter, main ultra-precision machining technology for manufacturing the critical components is introduced, which includes single point turning, five axis milling, microchiseling, micromilling, and ultra-precision

show abstract

Section: Processing Techniques For Machining Hard and Brittle Materialsmentioning

confidence: 99%

Processing Techniques of Critical Components

Chen

2020

Precision Manufacturing

View full text Add to dashboard Cite

show abstract

“…Our research team proposed a water-dissolution polishing technique [19,20], in which the water concentration is precisely regulated by micro-emulsion fluid consisting of alcohols, surfactant, and deionized water to achieve controllable deliquescence. The product of deliquescence is then removed by the polishing pad to achieve surface planarization [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on high-efficiency polishing for potassium dihydrogen phosphate (KDP) crystal by using two-phase air—water fluid

2020

Self Cite

View full text Add to dashboard Cite

A high-efficiency polishing approach using two-phase air—water fluid (TAWF) is proposed to avoid surface contamination and solve the inefficiency of previous water-dissolution polishing techniques for potassium dihydrogen phosphate (KDP) crystal. In the proposed method, controllable deliquescence is implemented without any chemical impurity. The product of deliquescence is then removed by a polishing pad to achieve surface planarization. The mechanism underlying TAWF polishing is analyzed, a special device is built to polish the KDP crystal, and the effect of relative humidity (RH) on polishing performance is studied. The relationship between key parameters of polishing and surface planarization is also investigated. Results show that the polishing performance is improved with increasing RH. However, precisely controlling the RH is extremely difficult during TAWF polishing. Controllable deliquescence can easily be disrupted once the RH fluctuates, which therefore needs to be restricted to a low level to avoid its influence on deliquescence rate. The material removal of TAWF polishing is mainly attributed to the synergistic effect of deliquescence and the polishing pad. Excessive polishing pressure and revolution rate remarkably reduce the life of the polishing pad and the surface quality of the KDP crystal. TAWF polishing using IC-1000 and TEC-168S increase the machining efficiency by 150%, and a smooth surface with a root mean square surface roughness of 5.5 nm is obtained.

show abstract

“…As pointed out by Menapace et al . [13] and Gao et al [5], environmental water adsorption on the KDP crystal surface is becoming an additional challenge for the ultra‐precision machining process for such soft and brittle crystals. However, it is still a lack of investigation of the influence of water in the ambient atmosphere on the removal behaviour of KDP crystal, in particular from the microscopic view.…”

Section: Introductionmentioning

confidence: 99%

“…Introduction: Potassium dihydrogen phosphate (KH 2 PO 4 , KDP) crystal has been intensively used as a critical nonlinear optical material in high-power laser systems such as Inertial Confinement Fusion in the National Ignition Facility of USA for laser frequency doubling, electro-optical modulation and photoelectric switch due to its large nonlinear conversion coefficient, high optical uniformity and good transmission band characteristics [1][2][3]. However, KDP crystal is extremely soft (2.5 Mohs hardness), brittle, deliquescent and thermally sensitive, which makes it difficult to fabricate a desirable optical surface with stringent specifications (≤λ/6 transmitted wavefront distortion Peak-Valley (PV), ≤5 nm root-mean-square surface roughness R ms , ≥15 J/cm 2 laser-induced damage threshold) for the aforementioned laser systems [3][4][5]. The ultra-precision machining of KDP crystal has become a challenging subject for academia and industry.…”

mentioning

confidence: 99%

“…The ultra-precision machining of KDP crystal has become a challenging subject for academia and industry. Various advanced techniques have been used for KDP crystal machining [3][4][5], including single-point diamond turning (SPDT, or referred to as diamond flycutting elsewhere) [6][7][8][9][10][11] and ultra-precision grinding [12]. Fuchs et al [6] in Lawrence Livermore National Laboratory first reported the application of SPDT in manufacturing KDP components.…”

mentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Research progress on ultra-precision machining technologies for soft-brittle crystal materials

Cited by 13 publications

References 53 publications

Processing Techniques of Critical Components

Processing Techniques of Critical Components

Experimental study on high-efficiency polishing for potassium dihydrogen phosphate (KDP) crystal by using two-phase air—water fluid

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

Contact Info

Product

Resources

About