Magnesium aluminate spinel ceramics infiltrated with lanthanum-glass for dental applications
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Paula Cipriano da Silva
Abstract
In this work, porous ceramic substrates based on magnesium aluminate spinel (MAS), Mg2Al2O4, were infiltrated with a lanthanum-rich glass for applications as dental ceramic material. The substrates were fabricated by uniaxial compaction of the spinel powder at 100 MPa for 60 s and sintering at 1 550 °C, 1 600 °C or 1 650 °C for 2 h. The porosity of the substrates after sintering varied between 17 vol.% and 24 vol.%. The substrates were then infiltrated with a lanthanum-rich glass at 1 140 °C for 2 h. After infiltration, dense ceramics were obtained, while hardness, fracture toughness and flexural strength varied from 850 to 1 000 HV, 2.8 to 3.5 MPa · m1/2 and 235 to 305 MPa, respectively, as a function of glass content. Theoretical calculations indicate that the amount of infiltrated secondary glassy phase should be about 17 vol.%, in order to obtain the highest crack propagation resistance.
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Articles in the same Issue
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- The effect of austempering on the microstructure and mechanical properties of PM Fe-0.8c steel aloyed with copper and nickel
- Enhancing the microstructure and grain refining performance of Al-5Ti-1B master alloy by a gas atomization process
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- Die-casting aluminum alloys for high-efficiency thermal radiation components
- Wear and corrosion of in-situ formed Al3Zr aluminide reinforced Al3003 surface composite
- Magnesium aluminate spinel ceramics infiltrated with lanthanum-glass for dental applications
- Short Communications
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Articles in the same Issue
- Original Contributions
- Thermodynamic re-assessment of the binary Cr–Ta system down to 0 K
- Thermodynamic analysis of precipitation behavior of M23C6 carbide in Nimonic 105 superalloy
- Texture evolution of magnesium alloy AZ31 during high temperature tensile deformation
- Effect of reciprocating extrusion temperature and passes on the microstructural evolution of Mg-5Sn-1Si-0.8Y alloy
- Constitutive modeling of flow behavior of CuZn39Pb2 alloy under hot working conditions
- The effect of austempering on the microstructure and mechanical properties of PM Fe-0.8c steel aloyed with copper and nickel
- Enhancing the microstructure and grain refining performance of Al-5Ti-1B master alloy by a gas atomization process
- Aging response investigation of 2017 Al alloy processed by gravity and squeeze casting
- Die-casting aluminum alloys for high-efficiency thermal radiation components
- Wear and corrosion of in-situ formed Al3Zr aluminide reinforced Al3003 surface composite
- Magnesium aluminate spinel ceramics infiltrated with lanthanum-glass for dental applications
- Short Communications
- Influence of pre-rolling on microstructural evolution of non-basal textured magnesium alloy
