Effects of AlN content on mechanical and optical properties of AlON transparent ceramics

Reactive sintered highly transparent AlON ceramics with Y2O3‐MgAl2O4‐H3BO3 ternary additive

“…A comparison of the optical performance of the one‐step reactive sintered ceramics prepared in this study with those of the previously reported data (Figure 3(B)) revealed that a breakthrough in this study has been achieved in terms of the thickness and transmittance. Moreover, the transmittance of the ceramics (81% at 600 nm) prepared in this study was comparable to that of transparent AlON ceramics fabricated using the CRN method 17,18 . Nevertheless, we also noticed that the transmittance of the obtained sample still has a gap with the theoretical value of 85.2%, which was ascribed to residual pores, as shown in Figures 2 and 3.…”

Pressureless sintering of transparent AlON ceramic with assimilable γ‐Al2O3 as sintering promoting additives

“…The concentration of γ‐Al 2 O 3 nano‐powder seems to have no obvious effects on the distribution of grain size, which is different from traditional sintering additives 27,28 . The mean grain size of all the samples is about 10 μm, which is much smaller than other AlON samples doped with traditional sintering additives 29,30,26,32 …”

“…27,28 The mean grain size of all the samples is about 10 μm, which is much smaller than other AlON samples doped with traditional sintering additives. 29,30,26,32 Five valid indentations were made at the same load of 0.3 Kg for each sample, as can be seen in the inserted SEM image of 3,15,31,33 The in-line transmittance parameters of AlON ceramics were determined and the result is shown in Figure 10. Sample0 is translucent and only has an in-line transmit-tance of 47%.…”

Fast one‐step carbothermal reduction and nitridation method using nano‐sized Al2O3 and carbon black to prepare aluminium oxynitride powder for highly transparent ceramics

“…%. 25 It can be seen that, at higher dwelling temperature (1620 • C vs. 1550 • C), within longer dwelling time span (5 h vs. 1-2 h) and with more carbon content (5.79 wt.% vs. 5.60 wt.%), the formed AlN was still less than the theoretically required amount. In fact, AlN can be continuously formed once its formation temperature is achieved, because over amount of carbon is provided in the starting Al 2 O 3 /C mixture.…”

“…In fact, the detected AlN amount after the first dwelling step was far less than the required one. 25 Guo et al reported that, in an extreme case of using 5.79 wt.% carbon black powder as reducer mixed with Al 2 O 3 powder, the AlN content in the powder treated at 1620 • C for 5 h was only 29.7 mol. %.…”