Effects of CO2 Laser Surface Processing on Fracture Behavior of Silicon Nitride Ceramic

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

doi:10.1115/1.2203104

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Sometimes a simple heating in a slightly oxidative environment will suffice. Alternatively, one can heat the material surface via laser or infrared heat source, to heal surface cracks (Harrer, Danzer, & Morrell, 2012;Sun, Malshe, Jiang, & McCluskey, 2006).…”

Section: Finishingmentioning

confidence: 99%

Synthesis/Processing of Silicon Nitride Ceramics

Pasto¹

2014

Comprehensive Hard Materials

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Section: Finishingmentioning

confidence: 99%

Synthesis/Processing of Silicon Nitride Ceramics

Pasto¹

2014

Comprehensive Hard Materials

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“…They indicated that laser processing resulted in compressive residual stress in the irradiated region. Sun et al 12 investigated the effects of CO 2 laser surface processing on fracture behaviour of silicon nitride ceramic. They showed that laser surface processing had significant effects on fracture behaviour of flexure Si 3 N 4 samples.…”

Section: Introductionmentioning

confidence: 99%

Laser treatment of silicon at nitrogen ambient: Thermal stress analysis

Yilbaş

Arif

Karataş

2011

Surface Engineering

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Laser control melting of silicon surface is carried out at nitrogen gas environment and temperature rise as well as thermal stress developed in the irradiated region is simulated using the finite element method. The residual stress developed in the surface region after the laser treatment is measured using the XRD technique and the measurement results are compared with the predictions. The fracture toughness of the laser treated surface is also measured using the indentation tests. The structural and morphological changes in the laser irradiated region are examined using the scanning electron microscope. It is found that b phase silicon nitride was formed in the surface region of the laser treated workpiece. The temperature gradient close to the laser beam spot attains significantly high values due to the high heating and cooling rates. This, in turn, results in high stress levels in this region during the laser treatment process. The laser treated surface was free from the defects including microcracks, voids and cavitations.

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“…It was established that crack-free surface treatment can be obtained by applying CO2 lasers [7, 15 -17]. Surface and bulk properties such as hardness [2], fracture toughness [3 -6], wear and friction [17], bending strength and surface morphology [18,19], were improved as result of the laser surface treatment. Another rare piece of research that employed laser surface treatment to strengthen a Si3N4 ceramic bullet proof vest was in the work of Harris et.…”

Section: Introductionmentioning

confidence: 99%

Surface engineering alumina armour ceramics with laser shock peening

Shukla

Robertson

et al. 2017

Materials & Design

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Citation: SHUKLA, P.P., 2017. Surface engineering alumina armour ceramics with laser shock peening. Materials and Design, 134, Additional Information:• results showed an increase in the surface hardness by 10% which was confirmed by a reduction in Vickers indentations size by 5%. The respective flaw sizes of the Vickers indentations were also reduced (10.5%) and inherently increased the KIc (12%). Residual stress state by X-ray diffraction method showed an average stress of -64 MPa after LSP, whilst the untreated surface stress measured +219 MPa. Further verification with the fluorescence method revealed surface relaxation with a maximum residual stress of -172 MPa after LSP of the Al2O3 armour ceramic. These findings are attributed to a microstructural refinement, grain size reduction and an induction of compressive stress that was relaxing the top/near surface layer from the pre-existing tensile stresses after LSP.Further process refinement/optimization will provide better control of the surface properties and will act as a strengthening technique to improve the performance of armour ceramics to stop bullets for a longer period of time and protect the end-users.

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Effects of CO2 Laser Surface Processing on Fracture Behavior of Silicon Nitride Ceramic

Cited by 10 publications

References 21 publications

Synthesis/Processing of Silicon Nitride Ceramics

Synthesis/Processing of Silicon Nitride Ceramics

Laser treatment of silicon at nitrogen ambient: Thermal stress analysis

Surface engineering alumina armour ceramics with laser shock peening

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