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

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

doi:10.1115/1.2203104

Journal of Engineering Materials and Technology | Volume 128 | Issue 3 | Research Paper

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Effects of ${CO}_{2}$ Laser Surface Processing on Fracture Behavior of Silicon Nitride Ceramic

Li Sun, Ajay P. Malshe, Wenping Jiang and Philip H. McCluskey

[+] Author and Article Information

Li Sun, Wenping Jiang

Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR 72701

Ajay P. Malshe¹

Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR 72701apm2@engr.uark.edu

Philip H. McCluskey

Technology & Solutions Division, Caterpillar Inc., Peoria, IL 61629

Corresponding author.

J. Eng. Mater. Technol 128(3), 460-467 (Jan 23, 2006) (8 pages) doi:10.1115/1.2203104 History: Received August 02, 2005; Revised January 23, 2006

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Abstract

Surface defects generated by grinding deteriorate the flexural strength of the silicon nitride $({Si}_{3} N_{4})$ ceramic. In this paper, ${CO}_{2}$ laser surface processing was applied to eliminate the grinding-induced defects. SEM micrograph showed that the surface integrity of ${Si}_{3} N_{4}$ samples was improved after laser processing. Four-point bending tests and fractographic analysis indicated that the flexural strength and fracture origins were affected by the change of surface integrity in laser-treated ${Si}_{3} N_{4}$ samples. The effect of grinding-induced residual stress on flexural strength of laser-treated samples was discussed. It was concluded that laser surface processing had significant effects on fracture behavior of flexure ${Si}_{3} N_{4}$ samples.

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Microstructure of the Si3N4 ceramic in this study

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Figure 1

Microstructure of the Si3N4 ceramic in this study

Experimental setup for CO2 laser surface processing of Si3N4 samples

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Figure 2

Experimental setup for CO2 laser surface processing of Si3N4 samples

Surface morphology of Si3N4 samples before and after laser treatments

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Figure 3

Surface morphology of Si3N4 samples before and after laser treatments

$The total area of cavities and fracture areas in an area of 4000μm2 on the surface of samples before and after laser treatments$

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$The total area of cavities and fracture areas in an area of 4000μm2 on the surface of samples before and after laser treatments$

Figure 4

The total area of cavities and fracture areas in an area of 4000μm2 on the surface of samples before and after laser treatments

Cross-sectional metallographs of Si3N4 samples: (a) untreated sample (SP: secondary phase); (b) laser treated with 70MW∕m2, 0.5mm∕s

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Figure 5

Cross-sectional metallographs of Si3N4 samples: (a) untreated sample (SP: secondary phase); (b) laser treated with 70MW∕m2, 0.5mm∕s

Average flexural strength of Si3N4 samples before and after CO2 laser treatments

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Figure 6

Average flexural strength of Si3N4 samples before and after CO2 laser treatments

Weibull strength distribution plot of Si3N4 samples before and after CO2 laser treatments

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Figure 7

Weibull strength distribution plot of Si3N4 samples before and after CO2 laser treatments

$SEM photos illustrating the fracture surface of an untreated sample (617MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

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$SEM photos illustrating the fracture surface of an untreated sample (617MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

Figure 8

SEM photos illustrating the fracture surface of an untreated sample (617MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin

$SEM photos showing the fracture surface of an untreated sample (583MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

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$SEM photos showing the fracture surface of an untreated sample (583MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

Figure 9

SEM photos showing the fracture surface of an untreated sample (583MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin

$SEM photos illustrating the fracture surface of a sample treated with condition 30MW∕m2‐0.1mm∕s(670MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

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$SEM photos illustrating the fracture surface of a sample treated with condition 30MW∕m2‐0.1mm∕s(670MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

Figure 10

SEM photos illustrating the fracture surface of a sample treated with condition 30MW∕m2‐0.1mm∕s(670MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin

$SEM photos showing the fracture surface of a sample treated with condition 70MW∕m2‐0.5mm∕s(721MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

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$SEM photos showing the fracture surface of a sample treated with condition 70MW∕m2‐0.5mm∕s(721MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin$

Figure 11

SEM photos showing the fracture surface of a sample treated with condition 70MW∕m2‐0.5mm∕s(721MPa): (a) fracture surface, (b) fracture mirror, and (c) fracture origin

$Correlation between the fracture origins and laser processing conditions$

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$Correlation between the fracture origins and laser processing conditions$

Figure 12

Correlation between the fracture origins and laser processing conditions

Residual stress of ground Si3N4 samples before and after CO2 laser treatments

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Figure 13

Residual stress of ground Si3N4 samples before and after CO2 laser treatments

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Sun L, Malshe AP, Jiang W, McCluskey PH. Effects of CO2 Laser Surface Processing on Fracture Behavior of Silicon Nitride Ceramic. ASME. J. Eng. Mater. Technol. 2006;128(3):460-467. doi:10.1115/1.2203104.

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Effects of ${CO}_{2}$ Laser Surface Processing on Fracture Behavior of Silicon Nitride Ceramic

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