Preparation of porous Y2SiO5 ceramics with relatively high compressive strength and ultra-low thermal conductivity by a TBA-based gel-casting method

In situ foam-gelcasting fabrication and properties of highly porous γ-Y2Si2O7 ceramic with multiple pore structures

“…Many porous ceramics with low thermal conductivity have been made, but the sintering of green bodies typically suffered severe linear shrinkage, such as 23.2% for porous SiO 2 (porosity 70.1%, sintered at 1150°C), 31.8% for YSZ (porosity 65%, sintered at 1550°C), as well as 18.9% and 20.8% for porous Y 2 SiO 5 (porosities 58.31%, sintered at 1500°C, and 62%, sintered at 1450°C, respectively) [5,7,14,15]. Obviously, the significant shrinkage frustrates the near-net-complex-shape preparation of sample with high porosity.…”

“…The small pores in skeleton may originate from the particle accumulation and evaporation of water and organic matter during the drying and sintering process [5,14,15], as well as the in situ reaction sintering of the Y 2 O 3 and SiO 2 starting powders [18,24]. The small pores retain similar morphology when the holding time is prolonged (3-5 h) or after several reheating circulations (2-4 times, from room temperature to 1550°C for 2 h).…”

Preparation, microstructure and high temperature performances of porous γ-Y2Si2O7 by in situ foam-gelcasting using gelatin

“…Therefore, a temperature of 1550 1C and a holding time of 2 h are selected as the optimized sintering conditions. Furthermore, the shrinkage of the sample synthesized at 1550 1C for 2 h is 7.7% (in Table 1 [9,13,14,37]. It is clearly seen that porous γ-Y 2 Si 2 O 7 ceramic prepared in this work has higher sintering stability than many others' works.…”

“…Fig. 6 shows the dependences of compressive strength on porosity and relative strength on [7,14,37,39]. The relationship between the relative compressive strength and relative density is shown in Fig.…”

On the elastic deformation properties of porous ceramic materials obtained by pore-forming agent method

“…It is due to several unique properties such as relatively low mass [1,2], low fractional density [3], low thermal conductivity [4], resistance to chemical attack [5], high specific surface area [6][7][8], high permeability and resistance to high temperature and thermal cycling [9][10][11][12]. For these reasons several materials are usually utilized for filters and membranes, as well as fuel cell electrodes, catalyst supports for biomaterials, piezoelectric materials, acoustically and thermally insulating bulk media [13][14][15].…”