Spark plasma sintering of Sm2O3-doped aluminum nitride

Sintering behavior, microstructure, and thermal conductivity of dense AlN ceramics processed by spark plasma sintering with Y2O3–CaO–B additives

“…3 shows thermal conductivities of the SPS samples, measured by the laser flash method. Thermal conductivities of the SPS samples were in the range 80-90 W m À 1 K À 1 , comparable to those of the SPS samples investigated by Khor et al using a Sm 2 O 3 sintering additive [15] and the PLS samples in our previous work with a Y 2 O 3 -CaO-B additive [8]. The thermal conductivity of the SPS samples in this work tended to increase with increasing sintering temperature.…”

“…If we use both the SPS process and Y 2 O 3 -CaO-B additives the sintering temperature may be decreased below 1600 1C, as reported by Khor et al [15]. In this work we fabricate dense AlN ceramics by SPS with Y 2 O 3 -CaO-B additives, and investigate the sintering behavior, microstructures, and thermal conductivities of the samples produced.…”

“…There are several reports on densification of AlN ceramics by SPS. Khor [15]. In contrast sintering at 1800 1C for several hours is necessary for densification by pressureless sintering (PLS) with the same additives, clearly indicating the effects of SPS.…”

Effect of Sm2O3 content on microstructure and thermal conductivity of Spark Plasma Sintered AlN ceramics

“…This was similar to the results reported by Khor et al [9]. The role of sintering additive (Sm 2 O 3 ) is believe to be two-fold: (1) to lower the sintering temperature and aid densification through mechanisms like liquid-phase sintering and (2) to remove the oxygen atoms from the grain boundaries and lattices dissolved oxygen, which is known to be deleterious to thermal conductivity.…”

“…Therefore, rapid heating is available and the sintering time can be shortened. The SPS process has been widely used to fabricate various types of ceramics, such as SiC, Al 2 O 3 and Si 3 N 4 and so on [9,10].…”