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Toplam kayıt 8, listelenen: 1-8
Preparation of Ce and Nd beta-sialon ceramics by alpha ->beta sialon transformation
(Inst Materials, 1997)
It has previously been accepted that lanthanum and cerium do not form alpha-sialon structures because their ions are too large to enter the interstices in the structure. Recent work on heat treatment of rare earth densified ...
Thermal stability of rare earth densified ?-sialon ceramics
(1997)
Typical ?-sialon and mixed ?-ß sialon starting compositions were densified by either hot pressing or pressureless sintering using the oxides of Yb, Dy, Sm and Nd. The resulting materials were heat-treated at 1450°C for up ...
Preparation of multiple-cation alpha-SiAlON ceramics containing lanthanum
(Amer Ceramic Soc, 1999)
Until recently, it was accepted that Ce3+ cations, with an ionic radius (r) of 1.03 Angstrom, were too large to form an alpha-SiAlON structure. However, more-recent studies have shown that cerium cations can be incorporated ...
Preparation of multiple-cation ?-SiAlON ceramics containing lanthanum
(1999)
Until recently, it was accepted that Ce 3+ cations, with an ionic radius (r) of 1.03 Å, were too large to form an ?-SiAlON structure. However, more-recent studies have shown that cerium cations can be incorporated into ...
?ݧ Sialon Transformation in Calcium-containing ? -SiAlON Ceramics
(1999)
Recent studies on rare earth densified ?-sialon ceramics have shown that the resulting ?-sialon product, present either as a single phase or in conjunction with ß-sialon, is unstable when heat treated at lower (1350-1600°C) ...
Novel developments in a-SiAION ceramics
(2000)
Densification and stabilization of ct-sialon ceramics have been investigated by using oxides of large cations (Sr2+, La3+, Ce3+, Nd3+) and their equimolar mixtures with calcium or ytterbium as a principal cation. All ...
Hard and tough ?-SiAION ceramics
(2000)
Yb, Nd/Ca and Ce/Ca containing a-sialon starting compositions have been densified by either pressureless sintering or capsul free sinter/HIP'ing using "conventional" ?-Si3N4 powder. X-ray diffraction studies of both ...
New developments in ? -SiAlON ceramics
(1999)
Two different ?-sialon compositions have been densified by either pressureless sintering or capsul-free sinter HIPing using either single cation namely strontium, lanthanum, cerium, neodymium or their equimolar mixtures ...