Joining ZTA ceramic by using Dy2O3-Al2O3-SiO2 glass ceramic filler

Fabrication of porous gehlenite coating on Al2O3–ZrO2–SiC composite ceramics and its in vitro biological activities

“…19,20 More importantly, SiO 2 can be used as Si source to generate silicate substance (e.g., gehlenite (Ca 2 Al 2 SiO 7 )) coating via solid state reaction, 21 which was believed to improve the adhesion strength by forming a thin reaction layer between the coating and ceramic substrates. 22 In addition, Ca 2 Al 2 SiO 7 possesses a medium thermal expansion coefficient of 7.9 × 10 À6 /°C 23 that is very close to that of ZTA (8.35 × 10 À6 /°C), 11 suggesting a good match between Ca 2 Al 2 SiO 7 and ZTA substrate. Previous studies have demonstrated that Ca 2 Al 2 SiO 7 could release trace bioactive ions (e.g., Ca 2+ and Si 4+ ) in tissue microenvironment, which favored the bone tissue regeneration.…”

“…7 Furthermore, a lot of cracks formed inevitably during the heat treatment process because of the mismatch of thermal expansion coefficients between HA (15.2×10 −6 /°C) and ZTA (8.35×10 −6 /°C). 5,11 Recently, the calcium deficient HA coatings on porous TZP ceramics 8 and HA coatings on ZrO 2 ceramics 12 with high adhesive strength were successfully prepared by biomimetic method and sol–gel technique, respectively. However, the environmental degradation of ZrO 2 ceramics 13,14 and the relatively lower compressive and flexural strength of porous TZP and ZTA ceramics limit their application in load-bearing implants.…”

Microstructure and mechanical properties of Al2O3 ceramic joints achieved by Ag‐SiO2 braze in air

“…21 Furthermore, the crystallization of glass could lead to the formation of pores and microcracks due to the change in the coefficient of thermal expansion (CTE) of glass braze. 22 Reactive air brazing (RAB) using noble metals, such as Ag, Au, and Pt, with oxide components as braze, can also be carried out in air to join ceramics. 23,24 The added oxides, including CuO, V 2 O 5 , and Nb 2 O 5 , react with the ceramic substrate or modify the chemical compatibility of the ceramic surface, and thereafter, are well wetted by molten braze alloys.…”

“…In addition, brittle glass and crystals could cause joints to present inferior resistance to static or dynamic stresses 21 . Furthermore, the crystallization of glass could lead to the formation of pores and microcracks due to the change in the coefficient of thermal expansion (CTE) of glass braze 22 …”

Wetting Behavior of the Ag-5CuO Brazing Alloy on ZTA Composite Ceramic with/without CuO Coating in Air

“…Although some research on joining ZTA ceramics has been carried out [17][18][19][20][21], reports on air brazing ZTA ceramic by Ag-CuO alloys are very limited. Particularly, to the authors' knowledge, the wetting of Ag-CuO alloys on ZTA ceramic has never been reported.…”