IADR Abstract Archives
Mechanical and Optical Properties of Alumina Matrix Interpenetrating Phase Ceramics
Objectives: 1. To determine the effects of the use of a porogen and sintering temperature on the optical and mechanical properties of infiltrated alumina ceramics.
2. To determine the effects of different polymer infusion on the optical and mechanical properties of infiltrated alumina ceramics.
Methods:
Alumina powder: (A16SG, Almatis Inc., Leetsdale, PA) was mixed a dispersant or with a porogen (10% wt) and dispersant. Alumina discs were fabricated using a slip cast technique in which the suspension is poured into a gypsum mold and dried. After partially sintering at 1050 °C for 2 hours, each 2 mm-thick disc was randomly assigned according to groups with various final sintering temperatures (1250 °C, 1350 °C, and 1550 °C): 15 groups (n=10). After silane infiltration, each disc was dried in a vacuum oven at 90 °C for 24 hours. Two different resin solutions were prepared by mixing Urethane dimethacrylate (UDMA) with Triethylene glycol dimethacrylate (TEGDMA) or Poly(propylene glycol) (400) dimethacrylate (PPGDMA 400). Polymer infused alumina discs were cured with heat under pressure. The density was measured. The transparency parameter and visible light transmission were measured using a spectrophotometer (Color i7, X-rite Inc., Grand Rapid, MI). Biaxial flexural strength was tested with Universal testing machine (Instron, United States). Analysis of variance (ANOVA) followed by Tukey’s multiple-comparison test (p < 0.05) was used to analyze the density, mechanical and optical properties using JMP 14.0 statistical program.
Results: The average and standard deviation of % density and optical properties of different groups are shown in Table 1.
Conclusions: While increasing the porogen content during alumina disc preparation and increasing sintering temperature significantly improved optical properties, infiltration with different polymers has no significant effect on optical and mechanical properties.
2. To determine the effects of different polymer infusion on the optical and mechanical properties of infiltrated alumina ceramics.
Methods:
Alumina powder: (A16SG, Almatis Inc., Leetsdale, PA) was mixed a dispersant or with a porogen (10% wt) and dispersant. Alumina discs were fabricated using a slip cast technique in which the suspension is poured into a gypsum mold and dried. After partially sintering at 1050 °C for 2 hours, each 2 mm-thick disc was randomly assigned according to groups with various final sintering temperatures (1250 °C, 1350 °C, and 1550 °C): 15 groups (n=10). After silane infiltration, each disc was dried in a vacuum oven at 90 °C for 24 hours. Two different resin solutions were prepared by mixing Urethane dimethacrylate (UDMA) with Triethylene glycol dimethacrylate (TEGDMA) or Poly(propylene glycol) (400) dimethacrylate (PPGDMA 400). Polymer infused alumina discs were cured with heat under pressure. The density was measured. The transparency parameter and visible light transmission were measured using a spectrophotometer (Color i7, X-rite Inc., Grand Rapid, MI). Biaxial flexural strength was tested with Universal testing machine (Instron, United States). Analysis of variance (ANOVA) followed by Tukey’s multiple-comparison test (p < 0.05) was used to analyze the density, mechanical and optical properties using JMP 14.0 statistical program.
Results: The average and standard deviation of % density and optical properties of different groups are shown in Table 1.
Conclusions: While increasing the porogen content during alumina disc preparation and increasing sintering temperature significantly improved optical properties, infiltration with different polymers has no significant effect on optical and mechanical properties.
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