Design of Ultra-High Temperature Ceramic Nano-Composites from Multi-Scale Length Microstructure Approach

Nicola Gilli; Jeremy Lee Watts; William Fahrenholtz; Diletta Sciti; Laura Silvestroni

doi:10.1016/j.compositesb.2021.109344

Design of Ultra-High Temperature Ceramic Nano-Composites from Multi-Scale Length Microstructure Approach

Nicola Gilli
, Jeremy Lee Watts
, William Fahrenholtz
, Diletta Sciti
, Laura Silvestroni

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The evolution of the multi-scale microstructure of a (Zr,Ta)B ₂ solid solution was studied as a function of time and temperature. The ceramics were produced by hot pressing a mixture of ZrB ₂ with 15 vol% TaSi ₂ followed by annealing at 2100 °C. Formation of a super-saturated solid solution led to the precipitation of TaC nano-needles within the micron-sized boride grain matrix. Phase stability diagrams were used to define the conditions of partial pressure within the sintering chamber that drove precipitation of nano-inclusions in the form of either metal or carbide. Through this approach, other systems containing various transition metals were explored to design other formulations for in-situ nano-composites with unprecedented strength at ultra-elevated temperatures.

Original language	American English
Article number	109344
Journal	Composites Part B: Engineering
Volume	226
DOIs	https://doi.org/10.1016/j.compositesb.2021.109344
State	Published - Dec 1 2021

Keywords

Core-Shell
Electron Microscopy
Interface/Interphase
Nano-Structures
Sintering

Disciplines

Ceramic Materials

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10.1016/j.compositesb.2021.109344License: CC BY

https://doi.org/10.1016/j.compositesb.2021.109344

Cite this

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title = "Design of Ultra-High Temperature Ceramic Nano-Composites from Multi-Scale Length Microstructure Approach",

abstract = " The evolution of the multi-scale microstructure of a (Zr,Ta)B 2 solid solution was studied as a function of time and temperature. The ceramics were produced by hot pressing a mixture of ZrB 2 with 15 vol\% TaSi 2 followed by annealing at 2100 °C. Formation of a super-saturated solid solution led to the precipitation of TaC nano-needles within the micron-sized boride grain matrix. Phase stability diagrams were used to define the conditions of partial pressure within the sintering chamber that drove precipitation of nano-inclusions in the form of either metal or carbide. Through this approach, other systems containing various transition metals were explored to design other formulations for in-situ nano-composites with unprecedented strength at ultra-elevated temperatures.",

keywords = "Core-Shell, Electron Microscopy, Interface/Interphase, Nano-Structures, Sintering",

author = "Nicola Gilli and Watts, \{Jeremy Lee\} and William Fahrenholtz and Diletta Sciti and Laura Silvestroni",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = dec,

day = "1",

doi = "10.1016/j.compositesb.2021.109344",

language = "American English",

volume = "226",

journal = "Composites Part B: Engineering",

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TY - JOUR

T1 - Design of Ultra-High Temperature Ceramic Nano-Composites from Multi-Scale Length Microstructure Approach

AU - Gilli, Nicola

AU - Watts, Jeremy Lee

AU - Fahrenholtz, William

AU - Sciti, Diletta

AU - Silvestroni, Laura

PY - 2021/12/1

Y1 - 2021/12/1

N2 - The evolution of the multi-scale microstructure of a (Zr,Ta)B 2 solid solution was studied as a function of time and temperature. The ceramics were produced by hot pressing a mixture of ZrB 2 with 15 vol% TaSi 2 followed by annealing at 2100 °C. Formation of a super-saturated solid solution led to the precipitation of TaC nano-needles within the micron-sized boride grain matrix. Phase stability diagrams were used to define the conditions of partial pressure within the sintering chamber that drove precipitation of nano-inclusions in the form of either metal or carbide. Through this approach, other systems containing various transition metals were explored to design other formulations for in-situ nano-composites with unprecedented strength at ultra-elevated temperatures.

AB - The evolution of the multi-scale microstructure of a (Zr,Ta)B 2 solid solution was studied as a function of time and temperature. The ceramics were produced by hot pressing a mixture of ZrB 2 with 15 vol% TaSi 2 followed by annealing at 2100 °C. Formation of a super-saturated solid solution led to the precipitation of TaC nano-needles within the micron-sized boride grain matrix. Phase stability diagrams were used to define the conditions of partial pressure within the sintering chamber that drove precipitation of nano-inclusions in the form of either metal or carbide. Through this approach, other systems containing various transition metals were explored to design other formulations for in-situ nano-composites with unprecedented strength at ultra-elevated temperatures.

KW - Core-Shell

KW - Electron Microscopy

KW - Interface/Interphase

KW - Nano-Structures

KW - Sintering

UR - https://scholarsmine.mst.edu/matsci_eng_facwork/2795

UR - https://doi.org/10.1016/j.compositesb.2021.109344

U2 - 10.1016/j.compositesb.2021.109344

DO - 10.1016/j.compositesb.2021.109344

M3 - Article

VL - 226

JO - Composites Part B: Engineering

JF - Composites Part B: Engineering

M1 - 109344

ER -

Design of Ultra-High Temperature Ceramic Nano-Composites from Multi-Scale Length Microstructure Approach

Abstract

Keywords

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