# Ultra High Temperature Deformation Resistivity in SPS Consolidated Transition Metal Diborides

https://mdr.nims.go.jp/datasets/854f8e4d-738f-455f-a3d9-8e5839099159

## Files

- [3K02-CSJ Annual Mwwting 2026 Mar 6.pdf](https://mdr.nims.go.jp/filesets/5445741e-4e92-4e52-8f03-b635f7d1b220/download) ([Detail](https://mdr.nims.go.jp/filesets/5445741e-4e92-4e52-8f03-b635f7d1b220.md))

## Id

854f8e4d-738f-455f-a3d9-8e5839099159

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-03-18T07:32:52.878458Z

## Updated at

2026-03-20T23:30:41.767671Z

## Published at

2026-03-20T12:43:43.888412Z

## Doi

https://doi.org/10.48505/nims.6228

## First published url



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## Resource type

conference_presentation

## Manuscript type

na

## Collection



## Title

- title: Ultra High Temperature Deformation Resistivity in SPS Consolidated Transition
    Metal Diborides
  title_type: original
  lang: en

## Description

- description: UHT ceramics are essential for aerospace, energy, and power applications,
    where maintaining mechanical integrity under extreme thermal conditions is critical.
    Bulk NbB₂ ceramics, consolidated via SPS at 1900 °C, achieved 98% density and
    6 µm grains, with flexural strength around 420 MPa from room temperature up to
    1600 °C, increasing to 430 MPa at 1700 °C before failure at 1800 °C. TaB₂ with
    grains of 3–7 µm, SPSed at 2000–2200 °C, displayed strength variations of about
    50 MPa up to 1800 °C and exhibited elastic fracture below 1900 °C, with strength
    rising to 400 MPa. Above 1900 °C, strength became dependent on loading rate, and
    mixed fracture was observed only in 2200 °C specimens. Reactive SPS processed
    at 2150 °C yielded bulk TaB with high hardness (18.5 GPa), toughness (9.8 MPa·m¹ᐟ²),
    and strength increasing from 330 MPa to 425 MPa at 1800 °C. TiB₂–NbB₂ composites
    showed strengths of 330 MPa at room temperature and about 400 MPa at 1200–1600 °C,
    shifting to plastic fracture at 1800 °C. A hierarchical Zr–Ta multiboride demonstrated
    hardness between 22–28 GPa and strength around 400 MPa up to 2000 °C. All these
    systems maintained nearly temperature-independent strength up to 1800–2000 °C,
    underscoring their suitability for extreme environments.
  description_type: abstract
  lang: eng

## Creator

- name: VASYLKIV Oleg
  role: author
  orcid: https://orcid.org/0000-0002-5041-6130
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Optical Materials
    Field/Polycrystalline Optical Material Group

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## Keyword

- subject: Transition Metal Diborides
  schema: not_defined
- subject: SPS
  schema: not_defined
- subject: Ultra‑High‑Temperature Deformation Resistivity
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

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## Embargo



## Journal



## Conference

name: 公益社団法人 日本セラミックス協会2026年年会
start_date: 2026-03-04
end_date: 2026-03-06
identifier: https://nenkai2026.ceramic.or.jp/

## Related item



## Funding

- identifier: AB3080
  funder_name: NIMS
  description: "\t多結晶光学材料\tResearch toward Innovative Optical Materials"
- identifier: KCB101
  funder_name: JSPS
  description: 非晶質相形成による超高温セラミックスの高  KAKENHI Grants-in-Aid for Scientific Research
    24K08035.

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## Fileset

- id: 5445741e-4e92-4e52-8f03-b635f7d1b220
  filename: 3K02-CSJ Annual Mwwting 2026 Mar 6.pdf
  content_type: application/pdf
  size: 8751102
  md5: a215b4368477fe3d9504ddc116c6113c

## Thumbnail

fileset_id: 5445741e-4e92-4e52-8f03-b635f7d1b220
filename: 3K02-CSJ Annual Mwwting 2026 Mar 6.pdf