Investigation of microstructure and properties in short carbon fiber reinforced silica-based ceramic cores via atmosphere sintering

Existing state and solidification characteristics of heavy metals in glass‐ceramics from Mn‐bearing blast furnace slag

“…On the whole, the concentrations of Mn 2+ are higher than Mn 4+ in glass‐ceramics, which is consistent with the analysis results in DSC measurement. This phenomenon is probably because very small amounts of unburned carbon in BSBFS can create a weak reducing atmosphere in the melting process of glass‐ceramics 35–37 . As a result, some amount of Mn 4+ can be reduced into Mn 2+ .…”

“…This phenomenon is probably because very small amounts of unburned carbon in BSBFS can create a weak reducing atmosphere in the melting process of glassceramics. [35][36][37] As a result, some amount of Mn 4+ can be reduced into Mn 2+ .…”

Effect of BPO4 on phase transition behavior and sintering of quartz materials

“…In Figure 5D, the lower CMOR value of the quartz material is due to the formation of a large amount of cristobalite in the sample at high temperatures, which is consistent with the results of the relevant literature. 9,20 The B0 sample reached its maximum intensity at 1300 • C as the heat treatment temperature increased. The reason is that the temperature increase promoted the sintering of the sample and enhanced the mechanical properties of the material.…”

“…6 In order to solve the problem of deterioration of the performance of materials due to quartz phase transition, adding a second phase to the quartz matrix is a common method to improve the comprehensive performance of ceramic materials. Common additives, such as Si 3 N 4 nanowires, 7 BN whiskers, 8 short carbon fibers, 9 B 4 C, 10 H 3 BO 3 , 11 and so forth. These additives have played a certain role in improving the properties of quartz.…”

Investigation of microstructure evolution and properties in silica‐based ceramic cores with alumina as a mineralizer

“…8,9 However, the complex microstructure evolution of fused silica during sintering and applications, such as the devitrification of amorphous silica, sintering densification, creep deformation, and low-/high-temperature crystal transformation of cristobalite, greatly affects the dimensional accuracy and thermal and mechanical properties of silica-based cores. [10][11][12] Additions of mineralizers, such as alumina 13 and zircon, 14,15 as well as such additives as carbon fibers, 16 mullite fibers, 17 silicone resin, 18 and cristobalite seeds, 19 have been proven to be effective measures for fabricating ceramic cores with comprehensive properties suitable for turbine blade castings. In addition, numerous studies have reported that controlling cristobalite crystallization is critical to the performance of silica-based ceramic cores.…”