Experimental investigation of laser surface processing of flexure silicon nitride ceramic

Sun, Li; Malshe, Ajay P.; Jiang, Wenping; McCluskey, P. H.

doi:10.1016/s1003-6326(06)60256-2

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…Imperfections, such as surface flaws and porosity, were minimised through surface melting of the Si 3 N 4 , which had also enhanced the flexural strength of the Si 3 N 4 . Sun et al 24 then took this investigation forward to show that the YSiAlON phase in Si 3 N 4 was softened through melting and in-filled the pre-existing fractures to increase the flexural strength. Furthermore, Segall et al 25 conducted a similar study by employing a high powered CO 2 laser to cover a fractured surface of a thin film Al 2 O 3 ceramic.…”

Section: Previous Laser Surface Processing Of Ceramicsmentioning

confidence: 99%

“…Research has progressed within the field of laser processing of engineering ceramics to elucidate the laser-material interaction. [23][24][25][26][27][28][29][30][31][32][33][34][35] Malshe et al 23 processed a Si 3 N 4 ceramic by employing a CO 2 laser to eliminate imperfections within the Si 3 N 4 followed by a three-point bending strength study of the ceramic after the CO 2 laser surface treatment. Imperfections, such as surface flaws and porosity, were minimised through surface melting of the Si 3 N 4 , which had also enhanced the flexural strength of the Si 3 N 4 .…”

Section: Previous Laser Surface Processing Of Ceramicsmentioning

confidence: 99%

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Modification of fracture toughness parameter K_1c following CO₂ laser surface treatment of Si₃N₄ engineering ceramic

Shukla

Lawrence

2011

Surface Engineering

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Surface treatment of a Si 3 N 4 engineering ceramic assisted by a CO 2 laser was conducted to identify changes in the fracture toughness parameter K 1c . The K 1c was determined by using a Vickers macrohardness indentation method before and after the CO 2 laser surface treatment. Optical microscopy and infinite focus variation techniques were then adopted to measure the crack length and to investigate the surface morphology as well as the crack geometry within the engineering ceramic. Thereafter, computational and analytical methods were employed to calculate the K 1c . Chemical analysis was further conducted to elucidate the change in composition as a result of the CO 2 laser surface irradiation. The results showed that a decrease in the near surface hardness of 7 and 44% in the resulting crack lengths was found with the Si 3 N 4 engineering ceramic following the CO 2 laser surface treatment. This inherently led to an increase in the K 1c . A rise in the K 1c of 64% for the Si 3 N 4 engineering ceramics was found (under the applied conditions) in comparison to the as received surface. This occurred due to the Si 3 N 4 engineering ceramic being oxidised and further forming a new surface layer, which was somewhat softer than that of the as received or laser unaffected surface. Compositional analysis showed that the formation of the new surface layer as a result of the CO 2 laser surface treatment was found to be SiO 2 .

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Section: Previous Laser Surface Processing Of Ceramicsmentioning

confidence: 99%

Section: Previous Laser Surface Processing Of Ceramicsmentioning

confidence: 99%

Modification of fracture toughness parameter K_1c following CO₂ laser surface treatment of Si₃N₄ engineering ceramic

Shukla

Lawrence

2011

Surface Engineering

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“…Silicon nitride ceramic has been used in various engineering applications such as bearings, rollers, and exhaust valves for automobiles because of its corrosion resistance, high-temperature strength and low density [1].…”

Section: Introductionmentioning

confidence: 99%

A Fundamental Study on the Prediction of Preheating Temperature of Silicon Nitride Ceramics by Using HPDL

Kim

Lee

2012

AMM

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Silicon nitride ceramic has been used in various engineering applications such as bearings, rollers, and exhaust valves for automobiles because of its corrosion resistance, high-temperature strength and low density. LAM (Laser assisted machining) has recently been considered as an alternative and effective process for machining ceramic materials. The laser heat sources in laser assisted milling processes are irregularly varied according to shapes of workpieces. Therefore, prediction and analysis of preheating temperature is difficult. In this study, the thermal analysis and experiment were performed to evaluate the surface temperature distribution of silicon nitride according to laser power. In addition, the preheating temperature was predicted by analyzing the results of the thermal analysis.

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A comparative study on the processing parameters during fibre and CO2 laser surface treatments of silicon nitride engineering ceramic

Shukla

Lawrence

2011

Int J Adv Manuf Technol

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This paper demonstrates a comparative study of a relatively novel fibre laser and a conventional CO 2 laser to surface-process silicon nitride (Si 3N 4) engineering ceramic. The objective of the research is to investigate the threshold of the novel fibre laser and compare it to the conventionally used CO 2 laser to process Si 3N 4 engineering ceramic and to produce a laser surface treatment free from major surface cracking without using any of the pre- or post heating techniques as this would increase the cost of the process and add more expense to the product when considering a bigger view point. The results showed that the fibre laser surface processing of the Si 3N 4 engineering ceramic differed to that of the CO 2 laser as the Gaussian beam modes, the beam quality factors, wavelength and the beam delivery systems were different between the two lasers. This consequently had a different effect on the surface of the Si 3N 4 engineering ceramic. The CO 2 laser wavelength when surface treating the Si 3N 4 engineering ceramic was being absorbed more than that of the fibre laser as higher power density and same traverse speed was used to reach the threshold for the Si 3N 4 engineering ceramic. © 2011 Springer-Verlag London Limited

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Experimental investigation of laser surface processing of flexure silicon nitride ceramic

Cited by 12 publications

References 14 publications

Modification of fracture toughness parameter K_1c following CO₂ laser surface treatment of Si₃N₄ engineering ceramic

Modification of fracture toughness parameter K_1c following CO₂ laser surface treatment of Si₃N₄ engineering ceramic

A Fundamental Study on the Prediction of Preheating Temperature of Silicon Nitride Ceramics by Using HPDL

A comparative study on the processing parameters during fibre and CO2 laser surface treatments of silicon nitride engineering ceramic

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Experimental investigation of laser surface processing of flexure silicon nitride ceramic

Cited by 12 publications

References 14 publications

Modification of fracture toughness parameter K1c following CO2 laser surface treatment of Si3N4 engineering ceramic

Modification of fracture toughness parameter K1c following CO2 laser surface treatment of Si3N4 engineering ceramic

A Fundamental Study on the Prediction of Preheating Temperature of Silicon Nitride Ceramics by Using HPDL

A comparative study on the processing parameters during fibre and CO2 laser surface treatments of silicon nitride engineering ceramic

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Modification of fracture toughness parameter K_1c following CO₂ laser surface treatment of Si₃N₄ engineering ceramic

Modification of fracture toughness parameter K_1c following CO₂ laser surface treatment of Si₃N₄ engineering ceramic