Processing and characterization of CrB2-based novel composites

R.D. Bedse; J.K. Sonber; K. Sairam; T.S.R.Ch Murthy; R.C. Hubli

doi:10.1515/htmp-2014-0084

Processing and characterization of CrB₂-based novel composites

R.D. Bedse, J.K. Sonber, K. Sairam, T.S.R.Ch Murthy, R.C. Hubli

Metallurgy and Materials

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

9 Citations (Scopus)

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Abstract

This paper presents the results of investigations carried out on processing and characterization of CrB₂-based novel composites. Niobium metal powder was used as additive to form new composites. Hardness and fracture toughness of chromium boride increased by addition of niobium. CrB₂ composites were prepared by addition of 2.5, 10 and 20 wt.% Nb. Density of higher than 95% ρ_th was achieved in all the samples. Hot pressed samples were analyzed to contain reaction products of NbB₂, Cr₂B₃ and Cr₃B₄ phases along with CrB₂. Hardness of CrB₂ composite was increased from 18.46 GPa to 21.89 GPa by increasing the Nb content from 2.5 to 10 wt.%. Fracture toughness of composites prepared by addition of 2.5 and 10% was measured as 3.11 and 3.38 MPa.m^1/2 respectively. Addition of 20% Nb resulted in increased fracture toughness of 4.32 MPa.m^1/2.

Original language	English
Pages (from-to)	683-687
Number of pages	5
Journal	High Temperature Materials and Processes
Volume	34
Issue number	7
DOIs	https://doi.org/10.1515/htmp-2014-0084
Publication status	Published - 13 Jan 2015

Keywords

CrB2
densification
niobium
hardness
fracture toughness
hot pressing

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10.1515/htmp-2014-0084Licence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

BedseRD2015ProcessingFinal published version, 2.48 MBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

https://doi.org/10.1515/htmp-2014-0084Licence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

Cite this

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title = "Processing and characterization of CrB2-based novel composites",

abstract = "This paper presents the results of investigations carried out on processing and characterization of CrB2-based novel composites. Niobium metal powder was used as additive to form new composites. Hardness and fracture toughness of chromium boride increased by addition of niobium. CrB2 composites were prepared by addition of 2.5, 10 and 20 wt.% Nb. Density of higher than 95% ρth was achieved in all the samples. Hot pressed samples were analyzed to contain reaction products of NbB2, Cr2B3 and Cr3B4 phases along with CrB2. Hardness of CrB2 composite was increased from 18.46 GPa to 21.89 GPa by increasing the Nb content from 2.5 to 10 wt.%. Fracture toughness of composites prepared by addition of 2.5 and 10% was measured as 3.11 and 3.38 MPa.m1/2 respectively. Addition of 20% Nb resulted in increased fracture toughness of 4.32 MPa.m1/2.",

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AU - Bedse, R.D.

AU - Sonber, J.K.

AU - Sairam, K.

AU - Murthy, T.S.R.Ch

AU - Hubli, R.C.

PY - 2015/1/13

Y1 - 2015/1/13

N2 - This paper presents the results of investigations carried out on processing and characterization of CrB2-based novel composites. Niobium metal powder was used as additive to form new composites. Hardness and fracture toughness of chromium boride increased by addition of niobium. CrB2 composites were prepared by addition of 2.5, 10 and 20 wt.% Nb. Density of higher than 95% ρth was achieved in all the samples. Hot pressed samples were analyzed to contain reaction products of NbB2, Cr2B3 and Cr3B4 phases along with CrB2. Hardness of CrB2 composite was increased from 18.46 GPa to 21.89 GPa by increasing the Nb content from 2.5 to 10 wt.%. Fracture toughness of composites prepared by addition of 2.5 and 10% was measured as 3.11 and 3.38 MPa.m1/2 respectively. Addition of 20% Nb resulted in increased fracture toughness of 4.32 MPa.m1/2.

AB - This paper presents the results of investigations carried out on processing and characterization of CrB2-based novel composites. Niobium metal powder was used as additive to form new composites. Hardness and fracture toughness of chromium boride increased by addition of niobium. CrB2 composites were prepared by addition of 2.5, 10 and 20 wt.% Nb. Density of higher than 95% ρth was achieved in all the samples. Hot pressed samples were analyzed to contain reaction products of NbB2, Cr2B3 and Cr3B4 phases along with CrB2. Hardness of CrB2 composite was increased from 18.46 GPa to 21.89 GPa by increasing the Nb content from 2.5 to 10 wt.%. Fracture toughness of composites prepared by addition of 2.5 and 10% was measured as 3.11 and 3.38 MPa.m1/2 respectively. Addition of 20% Nb resulted in increased fracture toughness of 4.32 MPa.m1/2.

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KW - niobium

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KW - fracture toughness

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