Mechanical properties and toughening mechanism of WC-doped ZrB2–ZrSi2 ceramic composites by hot pressing

Sha, Jianjun; Wei, Zhaocheng; Li, J.; Zhang, Z.F.; Yang, Xiong; Zhang, Y.C.; Dai, Jixiang

doi:10.1016/j.matdes.2014.04.083

Cited by 38 publications

(12 citation statements)

References 20 publications

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“…Reaction of amorphous B with Zr 16 or ZrH 2 9 resulted in the formation of nano-crystalline ZrB 2 at 950°C, which coarsened to produce sub-micron ZrB 2 particles following isothermal holds at 1450°C and 1650°C. 13,[30][31][32][33][34][35][36][37][38][39][40][41] Tungsten additions have been demonstrated to improve the strength of ZrB 2 based ceramics, with Chamberlain et al producing ZrB 2 -SiC containing W with a strength in excess of 1 GPa at room temperature. Previous studies of RHP ZrB 2 have all observed residual ZrO 2 present in the microstructure.…”

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confidence: 99%

“…29 Tungsten and zirconium carbide additions to ZrB 2 based ceramics have been examined by several research groups for their enhancements to oxidation resistance and/or mechanical properties. 13,[30][31][32][33][34][35][36][37][38][39][40][41] Tungsten additions have been demonstrated to improve the strength of ZrB 2 based ceramics, with Chamberlain et al producing ZrB 2 -SiC containing W with a strength in excess of 1 GPa at room temperature. 39 Tungsten additions have also been shown by Zou et al 34 and Silvestroni et al 40 to improve the elevated temperature mechanical properties.…”

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confidence: 99%

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Microstructure and mechanical properties of reaction‐hot‐pressed zirconium diboride based ceramics

Neuman

Fahrenholtz

2019

Int J Applied Ceramic Tech

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ZrB2 ceramics were prepared by in‐situ reaction hot pressing of ZrH2 and B. Additions of carbon and excess boron were used to react with and remove the residual oxygen present in the starting powders. Additions of tungsten were utilized to make a ZrB2‐4 mol%W ceramic, while a change in the B/C ratio was used to produce a ZrB2‐10 vol% ZrC ceramic. All three compositions reached near full density. The baseline ZrB2 and ZrB2–ZrC composition contained a residual oxide phase and ZrC inclusions, while the W‐doped composition contained residual carbon and a phase that contained tungsten and boron. All three compositions exhibited similar values for flexure strength (~520 MPa), Vickers hardness (~15 GPa), and elastic modulus (~500 to 540 GPa). Fracture toughness was about 2.6 MPa m1/2 for the W‐doped ZrB2 compared to about 3.8 MPa m½ for the ZrB2 and ZrB2–ZrC ceramics. This decrease in fracture toughness was accompanied by an observed absence of crack deflection in the W‐doped ZrB2 compared with the other compositions. The study demonstrated that reaction‐hot‐pressing can be used to fabricate ZrB2 based ceramics containing solid solution additives or second phases with comparable mechanical properties.

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confidence: 99%

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confidence: 99%

Microstructure and mechanical properties of reaction‐hot‐pressed zirconium diboride based ceramics

Neuman

Fahrenholtz

2019

Int J Applied Ceramic Tech

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“…Tungsten additions to ZrB 2 and HfB 2 based ceramics have been examined by several research groups, in view of substantial enhancements in oxidation resistance and bending strength up to 1600 °C121314151617. Figure 1 shows that the addition of 5 vol% of WC to a ZrB 2 –20 vol% SiC composite resulted in strengths above 600 MPa at 1600 °C when measured in argon12.…”

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Super-strong materials for temperatures exceeding 2000 °C

Silvestroni

Kleebe²,

Fahrenholtz

et al. 2017

Sci Rep

105

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Ceramics based on group IV-V transition metal borides and carbides possess melting points above 3000 °C, are ablation resistant and are, therefore, candidates for the design of components of next generation space vehicles, rocket nozzle inserts, and nose cones or leading edges for hypersonic aerospace vehicles. As such, they will have to bear high thermo-mechanical loads, which makes strength at high temperature of great importance. While testing of these materials above 2000 °C is necessary to prove their capabilities at anticipated operating temperatures, literature reports are quite limited. Reported strength values for zirconium diboride (ZrB2) ceramics can exceed 1 GPa at room temperature, but these values rapidly decrease, with all previously reported strengths being less than 340 MPa at 1500 °C or above. Here, we show how the strength of ZrB2 ceramics can be increased to more than 800 MPa at temperatures in the range of 1500–2100 °C. These exceptional strengths are due to a core-shell microstructure, which leads to in-situ toughening and sub-grain refinement at elevated temperatures. Our findings promise to open a new avenue to designing materials that are super-strong at ultra-high temperatures.

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“…From image it is found that the cross section is rough and rugged, and the pullout of grains is observed along the direction of the yellow arrows. This represents a typical morphology of intergranular fracture . Meanwhile, it is seen that TiC 0.3 N 0.7 grains (marked in black circle) have a firm combination with surrounding Si 3 N 4 grains which is beneficial to improve toughness of ceramics .…”

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confidence: 94%

Temperature‐driven wear behavior of Si₃N₄‐based ceramic reinforced by in situ formed TiC_0.3N_0.7 particles

et al. 2019

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Si 3 N 4 as a structural ceramic is desirable for applications in spacecraft, transportation, and energy, but its poor high-temperature properties still do not satisfy the actual requirements. Here, a TiC 0.3 N 0.7 reinforced Si 3 N 4 ceramic is successfully designed and fabricated via the high-temperature nitridation of TiC x . It is found that TiC 0.3 N 0.7 grains with the size of 1-2 μm are uniformly dispersed in the Si 3 N 4 matrix and show a firm bond with substrate. Compared with pure Si 3 N 4 , the doping of harder TiCN phase can effectively improve ceramic's hardness and fracture toughness at a certain temperature. Importantly, the ceramic material displays extraordinary wear resistance across a wide temperature range (eg, the wear rate of TiC 0.3 N 0.7 containing Si 3 N 4 over 63 times and 178 times better than pure Si 3 N 4 at 600 and 900°C, respectively). More broadly, a correlation between wear mechanism and temperature is established, and the result shows that the mechanical strength and tribochemical oxidation as two key factors determine the wear behavior of the material. These results developed here can provide a springboard for preparation and optimization of multiphase ceramics that serve under hightemperature conditions. K E Y W O R D S high temperature, mechanical properties, nitridation, Si 3 N 4 , wear/wear resistance

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Mechanical properties and toughening mechanism of WC-doped ZrB2–ZrSi2 ceramic composites by hot pressing

Cited by 38 publications

References 20 publications

Microstructure and mechanical properties of reaction‐hot‐pressed zirconium diboride based ceramics

Microstructure and mechanical properties of reaction‐hot‐pressed zirconium diboride based ceramics

Super-strong materials for temperatures exceeding 2000 °C

Temperature‐driven wear behavior of Si₃N₄‐based ceramic reinforced by in situ formed TiC_0.3N_0.7 particles

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Mechanical properties and toughening mechanism of WC-doped ZrB2–ZrSi2 ceramic composites by hot pressing

Cited by 38 publications

References 20 publications

Microstructure and mechanical properties of reaction‐hot‐pressed zirconium diboride based ceramics

Microstructure and mechanical properties of reaction‐hot‐pressed zirconium diboride based ceramics

Super-strong materials for temperatures exceeding 2000 °C

Temperature‐driven wear behavior of Si3N4‐based ceramic reinforced by in situ formed TiC0.3N0.7 particles

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Product

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Temperature‐driven wear behavior of Si₃N₄‐based ceramic reinforced by in situ formed TiC_0.3N_0.7 particles