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Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties

Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai Research Institute of Materials, Shanghai 200437, China
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Materials 2019, 12(17), 2717; https://doi.org/10.3390/ma12172717
Received: 2 August 2019 / Revised: 20 August 2019 / Accepted: 22 August 2019 / Published: 24 August 2019
Silicon nitride (Si3N4) ceramic materials are increasingly being used in deep-sea pressure-resistant applications because of their high compressive strength-to-weight ratio. In the present study, Si3N4 ceramic floatation spheres with an outer diameter of approximately 101 mm are successfully batch produced and evaluated. The implementation method was to prepare Si3N4 ceramic hemispherical housings and pair them together. In order to improve the safety of the joint, the hemispherical Si3N4 housings were gradually thickened from 1.80 to 2.50 mm at the equator near the joining surface, based on a 3D model with additive manufacturing technology. The weight-to-displacement ratio of the prepared floatation sphere is approximately 0.34 g/cm3. The flexural strength, compressive strength of the material and the collapse strength of a number of Si3N4 floatation spheres were tested to be 1150, 3847, and 205 MPa, respectively, to confirm the reliability of the process. Additional sustained and cyclic hydrostatic pressure tests simulating the full ocean depth working conditions are carried out on several Si3N4 floatation spheres, which perform very well and do not fail. View Full-Text
Keywords: silicon nitride; additive manufacturing; pressure housings; floatation spheres; full ocean depth; mechanical properties silicon nitride; additive manufacturing; pressure housings; floatation spheres; full ocean depth; mechanical properties
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MDPI and ACS Style

Qi, H.; He, C.; Zhang, P.; Han, W.; Guo, F.; Wu, F.; Du, M. Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties. Materials 2019, 12, 2717. https://doi.org/10.3390/ma12172717

AMA Style

Qi H, He C, Zhang P, Han W, Guo F, Wu F, Du M. Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties. Materials. 2019; 12(17):2717. https://doi.org/10.3390/ma12172717

Chicago/Turabian Style

Qi, Hai; He, Chenggui; Zhang, Peizhi; Han, Weiyue; Guo, Fangquan; Wu, Fen; Du, Miaofeng. 2019. "Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties" Materials 12, no. 17: 2717. https://doi.org/10.3390/ma12172717

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