Incorporating Zr combined Si and C to achieve self-repairing ability and enhancement of silica sol bonded SiC castables

Chen, Ding; Gu, Huazhi; Huang, Ao; Deng, Yanwen; Shao, Zhongcai

doi:10.1016/j.jallcom.2017.10.233

Cited by 13 publications

(4 citation statements)

References 30 publications

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“…26 Besides, it has been shown that an excessive Zr addition causes difficulties in brazing consolidation due to a massive volume increase, leading to a reduction in joint quality. 27 In the case of Si-rich filler, the joint strength is promising, but unreacted Si present in braze contributes to facile debonding at the Si-SiC inter-face at high temperatures, resulting in a joint with poor strength. 28,29 Therefore, to fully harness the potential of Ni-based alloys for bonding SiC ceramics without the formation of graphite and to enhance the processability of Ni-based alloys, it is necessary to incorporate an additional appropriate alloying element.…”

Section: Introductionmentioning

confidence: 99%

“…However, due to their pyrophoric nature, Zr powder must be handled and processed with extreme caution 26 . Besides, it has been shown that an excessive Zr addition causes difficulties in brazing consolidation due to a massive volume increase, leading to a reduction in joint quality 27 . In the case of Si‐rich filler, the joint strength is promising, but unreacted Si present in braze contributes to facile debonding at the Si–SiC interface at high temperatures, resulting in a joint with poor strength 28,29 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Mo addition on interfacial microstructure and mechanical property of SiC joint brazed by an Ni–Si filler

Kamal,

Shukla,

Shinde

et al. 2024

J Am Ceram Soc.

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Ni‐based alloys provide good brazing filler characteristics for the many applications of SiC ceramics. Nevertheless, the presence of graphite is unavoidable in the reaction between Ni and SiC, leading to a significant degradation of the mechanical properties of the joint. This study investigates the effect of Mo in Ni–30Si alloy on the brazing of SiC at 1300°C, to regulate interfacial reactions and reduce residual stresses by decreasing overall coefficient of thermal expansion (CTE) values throughout the brazing process. The addition of Mo up to 8 at.% efficiently suppresses graphite accumulation by converting it into Mo2C + Ni3Mo3C phases and lowering the CTE to 5.4 × 10−6/°C. When the Mo loading exceeds 12 at.%, the interactions between the filler and SiC are reduced as a result of the non‐homogeneous dispersion of Mo. The experimental findings indicate that the joint without graphite has a lap shear strength of 107 MPa, which is nearly three times greater than the joint with graphite. Thermodynamic analyses are performed to provide a comprehensive understanding of the underlying mechanisms responsible for the formation of distinct phases in brazed joints.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Mo addition on interfacial microstructure and mechanical property of SiC joint brazed by an Ni–Si filler

Kamal,

Shukla,

Shinde

et al. 2024

J Am Ceram Soc.

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“…In SiC‐based refractories, the bonding phases were filled between the SiC particles and connected the SiC particles, the stability of bonding phases greatly affected working life. However, the common bonding phases, including SiO 2 , clay, Si 3 N 4 , β‐SiC, Si 2 N 2 O, β‐Sialon, AlN polytype, and Ti 3 SiC 2 , in SiC‐based products could be corroded by hot water vapor 20–36 …”

Section: Introductionmentioning

confidence: 99%

“…However, the common bonding phases, including SiO 2 , clay, Si 3 N 4 , β-SiC, Si 2 N 2 O, β-Sialon, AlN polytype, and Ti 3 SiC 2 , in SiC-based products could be corroded by hot water vapor. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] Yb 2 Si 2 O 7 not only had good chemical stability but also performed close coefficient of thermal expansion (CTE) with SiC substrate, 37,38…”

Section: Introductionmentioning

confidence: 99%

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase

Zhang,

Chen,

Xue

et al. 2024

Int J Applied Ceramic Tech

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SiC‐based lining refractories used in incinerators faced serious hot water vapor corrosion. The pores in SiC‐based refractories played a crucial role in corrosion resistance because both the penetration of water vapor and the expulsion of corrosion products depended on diffusion channels provided by pores. The in situ microporous Yb2Si2O7 bonding phase formed in the SiC bricks after sintering at 1550°C under air atmosphere, which simultaneously decreased the apparent porosity and pore size. The optimization of pore structures reduced the permeability to gases of SiC bricks by 37.5%, which prevented the penetration of hot water vapor into SiC bricks. The microporous Yb2Si2O7‐bonded SiC bricks presented only .15% permanent linear change and showed good thermal shock resistance after corrosion at 1000°C for 100 h under hot water vapor atmosphere. Some SiC particles in the refractories could be adopted as high‐temperature pore‐forming agents; the gaseous oxidation products of SiC bricks, including SiO(g) and CO(g), contributed to the generation of microporous Yb2Si2O7 (pore size ≤5 μm) and SiC whiskers during sintering, which obviously improved mechanical properties and water vapor corrosion resistance of SiC bricks.

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Preparation and properties of alumina-carbon castables using SiC nanofiber coated graphite flake

et al. 2023

Applied Surface Science

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Incorporating Zr combined Si and C to achieve self-repairing ability and enhancement of silica sol bonded SiC castables

Cited by 13 publications

References 30 publications

Effect of Mo addition on interfacial microstructure and mechanical property of SiC joint brazed by an Ni–Si filler

Effect of Mo addition on interfacial microstructure and mechanical property of SiC joint brazed by an Ni–Si filler

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase

Preparation and properties of alumina-carbon castables using SiC nanofiber coated graphite flake

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Incorporating Zr combined Si and C to achieve self-repairing ability and enhancement of silica sol bonded SiC castables

Cited by 13 publications

References 30 publications

Effect of Mo addition on interfacial microstructure and mechanical property of SiC joint brazed by an Ni–Si filler

Effect of Mo addition on interfacial microstructure and mechanical property of SiC joint brazed by an Ni–Si filler

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb2Si2O7 bonding phase

Preparation and properties of alumina-carbon castables using SiC nanofiber coated graphite flake

Contact Info

Product

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Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase