Chen, I-Wei
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Publication Effect of Seeding on the Microstructure and Mechanical Properties of alpha-SiAlON: I, Y-SiAlON(2002-05-01) Shuba, Roman; Zenotchkine, Misha; Chen, I-Wei; Kim, Joo-SunThe effect of seeding on the microstructure and mechanical properties of single-phase Y-α-SiAlON ceramics with elongated grains has been studied. Seeds of the intended α-SiAlON compositions but with different size, shape, and number of grains have been compared for their effects. The microstructure, resistance (R-curve) behavior, and Weibull modulus are strongly correlated to the number density of the seeds. The highest fracture toughness reached is ~12 MPa∙m1/2 and can be obtained with as little as 1% seeding. The thermodynamic stability of seeds has been examined and is attributed to their chemical composition.Publication Synthesis of alpha-SiAlON Seed Crystals(2001-07-01) Shuba, Roman; Zenotchkine, Misha; Chen, I-Wei; Kim, Joo-SunSingle-phase seed crystals of Ca- and Y-α-SiAlONs have been synthesized for tailoring microstructure of α-SiAlON ceramics. The influence of composition, sintering temperature, and nitrogen pressure on the size and morphology of seeds has been explored. Guidelines for α-SiAlON seed preparation and morphology control are provided.Publication R-Curve Behavior of In Situ Toughened alpha-SiAlON Ceramics(2001-04-01) Shuba, Roman; Zenotchkine, Misha; Chen, I-Wei; Kim, Joo-SunR-curves of single-phase Y- and Ca-containing α-SiAlON ceramics have been measured. They range from flat ones for fine-grain ceramics to pronounced rising ones when large elongated grains are present. The highest toughness measured reached 11.5 MPa∙m1/2 over a crack extension of about 1000 μm.