TY - JOUR
T1 - High temperature microhardness of single crystal mullite
AU - Kriven, Waltraud M.
AU - Siah, Lay Foong
AU - Schmücker, Martin
AU - Schneider, Hartmut
PY - 2004/5
Y1 - 2004/5
N2 - The microhardness (H) of single crystal, orthorhombic mullite was measured on (010) and (001) faces from room temperature up to 1400°C. The microhardness versus temperature curves display sigmoidal shapes. The mean microhardness at room temperature is ∼16 Gpa and it decreases with temperature to H is ∼13 GPa at 300°C. At >300°C, the microhardness is only slightly reduced with temperature to H is ∼10 GPa at 1000°C. Above this temperature limit, it markedly decreases again, to a mean value of ≈6 GPa at 1400°C. Up to ∼1000°C the (010) and (001) microhardnesses are very similar. Above ∼1000°C, however, the hardness gradually becomes anisotropic, with H(010) being twice as high as H(010) at 1400°C (H(010) ∼ 8 GPa, H(010) ∼ 4 GPa).
AB - The microhardness (H) of single crystal, orthorhombic mullite was measured on (010) and (001) faces from room temperature up to 1400°C. The microhardness versus temperature curves display sigmoidal shapes. The mean microhardness at room temperature is ∼16 Gpa and it decreases with temperature to H is ∼13 GPa at 300°C. At >300°C, the microhardness is only slightly reduced with temperature to H is ∼10 GPa at 1000°C. Above this temperature limit, it markedly decreases again, to a mean value of ≈6 GPa at 1400°C. Up to ∼1000°C the (010) and (001) microhardnesses are very similar. Above ∼1000°C, however, the hardness gradually becomes anisotropic, with H(010) being twice as high as H(010) at 1400°C (H(010) ∼ 8 GPa, H(010) ∼ 4 GPa).
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U2 - 10.1111/j.1551-2916.2004.00970.x
DO - 10.1111/j.1551-2916.2004.00970.x
M3 - Article
AN - SCOPUS:3142679251
SN - 0002-7863
VL - 87
SP - 970
EP - 972
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 5
ER -