Two-step hot pressing of bimodal micron/nano-ZrB2 ceramic with improved mechanical properties and thermal shock resistance

Rujie He; Rubing Zhang; Yongmao Pei; Daining Fang

doi:10.1016/j.ijrmhm.2014.05.016

Two-step hot pressing of bimodal micron/nano-ZrB₂ ceramic with improved mechanical properties and thermal shock resistance

Rujie He^*, Rubing Zhang, Yongmao Pei, Daining Fang

^*Corresponding author for this work

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

25 Citations (Scopus)

Abstract

The densification and grain growth behaviors for micron- and nano-sized ZrB₂ particles were investigated. The densification on-set temperature (T_d-micron) and grain growth on-set temperature (T _g-micron) for micron-sized ZrB₂ particles were about 1500 °C and 1800 °C, respectively. And the densification on-set temperature (T_d-nano) and grain growth on-set temperature (T_g-nano) for nano-sized ZrB₂ particles were about 1300 °C and 1500 °C, respectively. A bimodal micron/nano-ZrB₂ ceramic was therefore prepared using a novel two-step hot pressing. A high relative density of 99.2%, an improved flexural strength of 580.2 ± 35.8 MPa and an improved fracture toughness of 7.2 ± 0.4 MPa·m^1/2 were obtained. The measured critical thermal shock temperature difference (ΔT _c) for this bimodal micron/nano-ZrB₂ ceramic was as high as 433 °C.

Original language	English
Pages (from-to)	65-70
Number of pages	6
Journal	International Journal of Refractory Metals and Hard Materials
Volume	46
DOIs	https://doi.org/10.1016/j.ijrmhm.2014.05.016
Publication status	Published - Sept 2014
Externally published	Yes

Keywords

Hot pressing
Mechanical properties
Microstructure
Thermal shock resistance

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10.1016/j.ijrmhm.2014.05.016

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He, R., Zhang, R., Pei, Y., & Fang, D. (2014). Two-step hot pressing of bimodal micron/nano-ZrB₂ ceramic with improved mechanical properties and thermal shock resistance. International Journal of Refractory Metals and Hard Materials, 46, 65-70. https://doi.org/10.1016/j.ijrmhm.2014.05.016

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title = "Two-step hot pressing of bimodal micron/nano-ZrB2 ceramic with improved mechanical properties and thermal shock resistance",

abstract = "The densification and grain growth behaviors for micron- and nano-sized ZrB2 particles were investigated. The densification on-set temperature (Td-micron) and grain growth on-set temperature (T g-micron) for micron-sized ZrB2 particles were about 1500 °C and 1800 °C, respectively. And the densification on-set temperature (Td-nano) and grain growth on-set temperature (Tg-nano) for nano-sized ZrB2 particles were about 1300 °C and 1500 °C, respectively. A bimodal micron/nano-ZrB2 ceramic was therefore prepared using a novel two-step hot pressing. A high relative density of 99.2%, an improved flexural strength of 580.2 ± 35.8 MPa and an improved fracture toughness of 7.2 ± 0.4 MPa·m1/2 were obtained. The measured critical thermal shock temperature difference (ΔT c) for this bimodal micron/nano-ZrB2 ceramic was as high as 433 °C.",

keywords = "Hot pressing, Mechanical properties, Microstructure, Thermal shock resistance",

author = "Rujie He and Rubing Zhang and Yongmao Pei and Daining Fang",

year = "2014",

month = sep,

doi = "10.1016/j.ijrmhm.2014.05.016",

language = "English",

volume = "46",

pages = "65--70",

journal = "International Journal of Refractory Metals and Hard Materials",

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TY - JOUR

T1 - Two-step hot pressing of bimodal micron/nano-ZrB2 ceramic with improved mechanical properties and thermal shock resistance

AU - He, Rujie

AU - Zhang, Rubing

AU - Pei, Yongmao

AU - Fang, Daining

PY - 2014/9

Y1 - 2014/9

N2 - The densification and grain growth behaviors for micron- and nano-sized ZrB2 particles were investigated. The densification on-set temperature (Td-micron) and grain growth on-set temperature (T g-micron) for micron-sized ZrB2 particles were about 1500 °C and 1800 °C, respectively. And the densification on-set temperature (Td-nano) and grain growth on-set temperature (Tg-nano) for nano-sized ZrB2 particles were about 1300 °C and 1500 °C, respectively. A bimodal micron/nano-ZrB2 ceramic was therefore prepared using a novel two-step hot pressing. A high relative density of 99.2%, an improved flexural strength of 580.2 ± 35.8 MPa and an improved fracture toughness of 7.2 ± 0.4 MPa·m1/2 were obtained. The measured critical thermal shock temperature difference (ΔT c) for this bimodal micron/nano-ZrB2 ceramic was as high as 433 °C.

AB - The densification and grain growth behaviors for micron- and nano-sized ZrB2 particles were investigated. The densification on-set temperature (Td-micron) and grain growth on-set temperature (T g-micron) for micron-sized ZrB2 particles were about 1500 °C and 1800 °C, respectively. And the densification on-set temperature (Td-nano) and grain growth on-set temperature (Tg-nano) for nano-sized ZrB2 particles were about 1300 °C and 1500 °C, respectively. A bimodal micron/nano-ZrB2 ceramic was therefore prepared using a novel two-step hot pressing. A high relative density of 99.2%, an improved flexural strength of 580.2 ± 35.8 MPa and an improved fracture toughness of 7.2 ± 0.4 MPa·m1/2 were obtained. The measured critical thermal shock temperature difference (ΔT c) for this bimodal micron/nano-ZrB2 ceramic was as high as 433 °C.

KW - Hot pressing

KW - Mechanical properties

KW - Microstructure

KW - Thermal shock resistance

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U2 - 10.1016/j.ijrmhm.2014.05.016

DO - 10.1016/j.ijrmhm.2014.05.016

M3 - Article

AN - SCOPUS:84902686524

SN - 0263-4368

VL - 46

SP - 65

EP - 70

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

ER -

Two-step hot pressing of bimodal micron/nano-ZrB₂ ceramic with improved mechanical properties and thermal shock resistance

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Keywords

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