Response of silicon nitride ceramics subject to laser shock treatment

Shukla, Pratik; Shen, Xiaojun; Allott, R.; Ertel, Klaus; Robertson, Stuart; Crookes, Robert G.; Wu, Houzheng; Zammit, Ann; Swanson, Philip; Fitzpatrick, M. E.

doi:10.1016/j.ceramint.2021.08.369

Cited by 13 publications

(5 citation statements)

References 41 publications

(39 reference statements)

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“…The laser treated area was 9 mm × 40 mm in a rectangular pattern as shown in Figure 1 (c). The shock pulse pressures were calculated using Equation mentioned elsewhere [33]. The LST work was conducted on a 45 × 10 mm patch for the 3 different energies following a zig-zag pattern.…”

Section: Laser Shock Treatment Set-upmentioning

confidence: 99%

“…Surface topography, hardness, fracture toughness (KIc), residual stresses, and microstructural changes were observed. The results showed an increase in KIC of 60%, a maximum of -289 MPa of compressive stress at 50 µm depth and using multiple layers of LST had induced beneficial residual stresses to a maximum measured depth of 512 μm [33]. Other than that, there has been no published work on the influence of LSP on ceramics, particularly, on ZrO2 ceramics.…”

Section: Introductionmentioning

confidence: 97%

“…The dislocation density measured by Cr +3 fluorescence increased after LSP, inferring plastic or micro plastic deformation directly under the surface and within the sub-surface of an alumina armour ceramic. Our recent study also explored laser shock treatment of a Si3N4 ceramic with a multiple-layer, square-beam [33]. Surface topography, hardness, fracture toughness (KIc), residual stresses, and microstructural changes were observed.…”

Section: Introductionmentioning

confidence: 99%

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Biocompatibility and Surface Integrity of Zirconia Ceramics Treated by Laser-plasma Driven Shock-waves

Shukla¹,

Zhang²,

Shen³

et al. 2022

Recent Prog Mater

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This is a multi-disciplinary paper focused on the preliminary results of deploying laser shock treatment (LST) to ZrO2 ceramics. This work has significance in several industrial sectors for components that will benefit from strengthening. These components are, namely: dental implants; cutting and drawing tools; valves, bearings, pressure vessels, heat exchangers and high-performance scissors and knives, where modification of hard, brittle materials properties such as that of a ZrO2, can yield a performance boost. To elucidate the influence of LST on ZrO2 ceramics, an Nd: YAG laser was used, exhibiting (operating at discrete) laser energies of 17 mJ, 85 mJ and 170 mJ, a 2 mm spot size, a pulse repetition rate of 5 Hz and pulse duration of 10 ns was deployed at 532 nm wavelength. Investigation of ZrO2 ceramic surface integrity revealed a transition from a crack-free topology to a surface dominated by fractures, as the laser energy increased from 85 mJ to 170 mJ. Residual stresses obtained by incremental hole drilling (IHD) were measured to be tensile in the upper layer and the sub-surface layer. However, compression of -595 MPa was found in the sub-surface of the ZrO2 ceramic to a depth of 350 µm after LST, particularly in the transverse direction. Biological analysis metabolic activity measurements, indicated a rise in activity for all samples as the contact time increased (24 h, 3 d and 7 d). The as-received surface revealed a more limited change in metabolism, retaining similar biochemical levels during the first 3 days followed by a slight increase after a week of cultivation, bringing about significant increase in activity in all LST surfaces, relative to the as-received condition. This suggested that a ZrO2 LST exhibited enhanced cell response, particularly, after 7 days of contact-time. The overall outcome of this introductory paper, not only showed that ZrO2 ceramics, can be laser shock treated/peened, to induce some possible beneficial mechanical and physical effects, microstructural and surface topography changes, but also showed that LST can facilitate improvement in cell response to the ZrO2 ceramic. This opens-up, new prospects for treatment of ZrO2 based ceramics for biological applications such as tooth implant screws, where avoiding fractures from mechanical loading, strength enhancement, as well as biocompatibility are all important.

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Section: Laser Shock Treatment Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biocompatibility and Surface Integrity of Zirconia Ceramics Treated by Laser-plasma Driven Shock-waves

Shukla¹,

Zhang²,

Shen³

et al. 2022

Recent Prog Mater

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show abstract

“…Akita et al reported that LP can introduce compressive residual stress into Si 3 N 4 [ 11 ]. Shukla et al reported that LP improves the hardness and fracture toughness of Al 2 O 3 [ 12 ] and Si 3 N 4 [ 13 ]. Shukla et al also reported that LP can introduce compressive residual stress and confirmed a considerable increase in dislocation density after LP in Al 2 O 3 [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, in previous studies, change in bending strength of ceramics after LP application had not been investigated, except by Akita et al [ 11 ]. Surface damage can be prevented by applying a coating called a sacrificial layer during LP construction and, in previous studies, laser peening with coating has been widely used for ceramics [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. However, the changes in residual stress and bending strength with and without coating are also not clear.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Bending Strength of Silicon Nitride through Laser Peening

et al. 2022

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This study aimed to improve the bending strength and reliability of ceramics using laser peening (LP). In the experiment, LP without coating (LPwC) and with coating (LPC) were applied to silicon nitride (Si3N4) under various conditions. The surface roughness, residual stress, and bending strength were then measured for the non-LP, LPwC, and LPC specimens. The results show that the LPwC specimen had a greater surface roughness but introduced larger and deeper compressive residual stress when compared with the non-LP and LPC specimens. In addition, the bending strength of the LPwC specimen was higher and scatter in bending strength was less compared with the non-LP and LPC specimens. This may be attributed to the transition of the fracture initiation point from the surface to the interior of the LPwC specimen because of the compressive residual stress introduced near the surface. Thus, it was demonstrated that the application of LP is effective in improving the strength and reliability of ceramics.

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