Microstructural evolution of Si(HfxTa1−x)(C)N polymer-derived ceramics upon high-temperature anneal

Thor, Nathalie; Bernauer, Jan; Petry, Nils‐Christian; Ionescu, Emanuel; Riedel, Ralf; Pundt, Astrid; Kleebe, Hans‐Joachim

doi:10.1016/j.jeurceramsoc.2022.11.060

Journal of the European Ceramic Society

2023

DOI: 10.1016/j.jeurceramsoc.2022.11.060

|View full text |Cite

Microstructural evolution of Si(HfxTa1−x)(C)N polymer-derived ceramics upon high-temperature anneal

Nathalie Thor

Jan Bernauer

Nils‐Christian Petry

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2023

2024

Publication Types

Select...

Article5

Relationship

Self Cite0

Independent5

Authors

Journals

Cited by 12 publications

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Thor,

Winkens,

Bernauer

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

The high‐temperature microstructural evolution and mechanical properties of two SiC‐based polymer‐derived ceramics (PDCs) with different Hf:Ta molar ratios are investigated using electron microscopy techniques and manipulated by nanoindentation. The as‐pyrolyzed ceramic powder consists of an amorphous Si(HfxTa1‐x)C(N,O) structure (where x=0.2, 0.7) with localized nano‐crystalline transition metal carbides (TMCs). Subsequent application of the field‐assisted sintering technique (FAST) for high‐temperature consolidation results in a crystalline (HfxTa1‐x)C/SiC ultra‐high temperature ceramic nanocomposite (UHTC‐NC). The microstructure contains powder particle‐sized grains and sinter necks between the former powder particles. The powder particles consist of a β‐SiC matrix and small TMCs. Large TMCs are observed on internal surfaces of former powder particles. This is due to the pulsed direct current (DC) and the resulting Joule heating that facilitates diffusion as well as oxygen impurities. Sinter necks of large β‐SiC grains form during the FAST process. The microstructural regions are assessed using high‐throughput nanoindentation. The hardness for SiC/(Hf0.7Ta0.3)C is measured on the formed grains and the sinter necks giving mean hardness values of about 27 GPa and 37 GPa, respectively.This article is protected by copyright. All rights reserved.

show abstract

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Thor,

Winkens,

Bernauer

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

Oxidation Resistance and Microstructural Analysis of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Nanocomposites

Petry,

Thor,

Bernauer

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

The oxidation behavior of polymer‐derived (HfxTa1‐x)C/SiC nanocomposites at 1200 °C and 1400 °C for up to 100 h is investigated in this work. Overall, the chemical modification of the polycarbosilane‐based precursor with Hf and Ta leads to an improved oxidation behavior due to an increased densification. Shifting the Hf/Ta ratio from (Hf0.2Ta0.8)C/SiC to (Hf0.7Ta0.3)C/SiC results in an improved oxidation behavior due to Hf6Ta2O17 formation and the reduction of Ta2O5 formation, which reduces cracking of the samples. The formation and microstructure of SiO2 as well as the internal oxidation of (HfxTa1‐x)C precipitates are explained by thermodynamic and kinetic considerations.This article is protected by copyright. All rights reserved.

show abstract

Evolution of conductive phase in SiCN ceramics for high piezoresistivity performance at high temperatures

Xu,

Huang,

Gao

et al. 2024

Ceramics International

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Microstructural evolution of Si(HfxTa1−x)(C)N polymer-derived ceramics upon high-temperature anneal

Cited by 12 publications

References 49 publications

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Oxidation Resistance and Microstructural Analysis of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Nanocomposites

Evolution of conductive phase in SiCN ceramics for high piezoresistivity performance at high temperatures

Contact Info

Product

Resources

About

Microstructural evolution of Si(HfxTa1−x)(C)N polymer-derived ceramics upon high-temperature anneal

Cited by 12 publications

References 49 publications

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (HfxTa1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (HfxTa1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Oxidation Resistance and Microstructural Analysis of Polymer‐Derived (HfxTa1−x)C/SiC Ceramic Nanocomposites

Evolution of conductive phase in SiCN ceramics for high piezoresistivity performance at high temperatures

Contact Info

Product

Resources

About

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Microstructure Characterization and Mechanical Properties of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering

Oxidation Resistance and Microstructural Analysis of Polymer‐Derived (Hf_xTa_1−x)C/SiC Ceramic Nanocomposites