Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Wang, Sihui; Zhang, Yancai; Sun, Yandong; Xu, Yao; Yang, Ming

doi:10.1016/j.jallcom.2016.06.250

Cited by 34 publications

(18 citation statements)

References 32 publications

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“…FT‐IR was also performed to characterize the chemical structures of pyrolysis product SiBCN and ZrB 2 –SiBCN ceramic samples. As shown in Figure , the typical absorption bands are Si–C (850‐650/cm), Si–N–Si (950‐830/cm), Si–O (1000‐1100/cm), Si–CH 3 (1275‐1260/cm), C=C (1635‐1690/cm), C–H (2919, 2850/cm), and N–H (3421‐3446/cm) . For the pyrolysis of PBSZ, the N–H, C–H and C=C stretching bands kept from 1000 to 1550°C, which may be attributed to the specific chemical structure (Figure ) of the precursor as well as the incomplete crosslinking.…”

Section: Discussionmentioning

confidence: 96%

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Medium‐temperature sintering efficiency of ZrB₂ ceramics using polymer‐derived SiBCN as a sintering aid

Feng

Zhang

et al. 2018

J Am Ceram Soc

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Polymer-derived SiBCN, with superior thermal stability and amorphous activity, was introduced into ZrB 2 powders. This sintering aid highly improved the sintering efficiency of ZrB 2 ceramics at medium temperature (1000-1600°C), which showed a different service temperature range from that of traditional crystal additives. The microstructure and densification behavior of ZrB 2 -SiBCN samples were mainly studied. The polymer structural evolution including construction, rearrangement, and crystallization of the amorphous SiBCN network, made a large contribution to the densification of ZrB 2 ceramics. The carbothermal reduction of pyrolysis carbon with oxide impurities could not only decrease the oxygen content, but also develop the activity of chemical bonds in SiBCN network. Diffusions and reactions at the interface also benefited the microstructure and consolidation of ZrB 2 -SiBCN ceramics. K E Y W O R D Sdensification, microstructure, polymer-derived SiBCN, sintering, Zirconium compounds

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Section: Discussionmentioning

confidence: 96%

“…Carbon exists on the side chain with structures of Si–CH 3 and Si–CH=CH 2 . The detailed synthesis process, structural model and related property of the precursor were reported in Papers . The empirical formula of the products after polymer pyrolysis at 1000°C was Si 1.00 N 0.84 B 0.16 C 0.90 O 0.15 H 1.15 .…”

Section: Methodsmentioning

confidence: 99%

Medium‐temperature sintering efficiency of ZrB₂ ceramics using polymer‐derived SiBCN as a sintering aid

Feng

Zhang

et al. 2018

J Am Ceram Soc

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“…As documented, the introduction of ultra-high temperature ceramics (UHTCs) into SiBCN ceramic matrix, is believed to be an effective strategy to improve the mechanical performance of SiBCN ceramics [11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

“…In previous attempts, the microstructural evolution and thermal stability of the porous PDCs ZrB 2 -SiBCN and HfN-SiBCN composite ceramics have been investigated [21,22] . However, due to the limitation of sample size, the mechanical properties of these composite ceramics have not been evaluated.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Wang

Yang

et al. 2020

Preprint

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In this paper, the in situ nano Ta4HfC5 reinforced SiBCN-Ta4HfC5 composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering. The microstructural evolution and mechanical properties of the resulting SiBCN-Ta4HfC5 were studied. After the first-step milling of 30 h, the raw materials of TaC and HfC undergone crushing, cold sintering and short-range interdiffusion to finally obtain the high pure nano Ta4HfC5. A hybrid structure of amorphous SiBCN and nano Ta4HfC5 was obtained by adopting a second-step ball-milling. After reactive hot-pressing sintering, amorphous SiBCN has crystallized to nano SiC and turbostratic BN(C) phases while Ta4HfC5 retained the form of nano structure. With the in situ generation of 2.5 wt% Ta4HfC5, Ta4HfC5 is preferentially distributed within the turbostratic BN(C); however, as Ta4HfC5 content further raised to 10 wt%, it mainly distributed in the grain-boundary of BN(C) and SiC. The introduction of Ta4HfC5 nanocrystals can effectively improve the flexural strength and fracture toughness of SiBCN ceramics, reaching to 344.1 MPa and 4.52 MPam1/2, respectively. This work has solved the problems of uneven distribution of ultra-high temperature phase in ceramic matrix, which is beneficial to the real applications of SiBCN ceramics.

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“…HfB 2 and HfN have high hardness, high melting point, and high oxidation resistance, and as reinforcements they can enhance the mechanical properties of ceramics such as ZrB 2 -CrSi 2 -HfB 2 , ZrB 2 -SiC-HfB 2 , B 4 C-HfB 2 , and SiBCN-HfN [17,18,19,20], which make them potential candidate reinforcements for ceramic tool materials. In addition, because HfB 2 and HfN have better thermal stability to resist deformation and decomposition at elevated temperature, they may improve the cutting performance and working life of TiB 2 -based ceramic tools.…”

Section: Introductionmentioning

confidence: 99%

Effects of HfB2 and HfN Additions on the Microstructures and Mechanical Properties of TiB2-Based Ceramic Tool Materials

Song

Liang

et al. 2017

Materials

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The effects of HfB2 and HfN additions on the microstructures and mechanical properties of TiB2-based ceramic tool materials were investigated. The results showed that the HfB2 additive not only can inhibit the TiB2 grain growth but can also change the morphology of some TiB2 grains from bigger polygons to smaller polygons or longer ovals that are advantageous for forming a relatively fine microstructure, and that the HfN additive had a tendency toward agglomeration. The improvement of flexural strength and Vickers hardness of the TiB2-HfB2 ceramics was due to the relatively fine microstructure; the decrease of fracture toughness was ascribed to the formation of a weaker grain boundary strength due to the brittle rim phase and the poor wettability between HfB2 and Ni. The decrease of the flexural strength and Vickers hardness of the TiB2-HfN ceramics was due to the increase of defects such as TiB2 coarse grains and HfN agglomeration; the enhancement of fracture toughness was mainly attributed to the decrease of the pore number and the increase of the rim phase and TiB2 coarse grains. The toughening mechanisms of TiB2-HfB2 ceramics mainly included crack bridging and transgranular fracture, while the toughening mechanisms of TiB2-HfN ceramics mainly included crack deflection, crack bridging, transgranular fracture, and the core-rim structure.

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Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Cited by 34 publications

References 32 publications

Medium‐temperature sintering efficiency of ZrB₂ ceramics using polymer‐derived SiBCN as a sintering aid

Medium‐temperature sintering efficiency of ZrB₂ ceramics using polymer‐derived SiBCN as a sintering aid

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Effects of HfB2 and HfN Additions on the Microstructures and Mechanical Properties of TiB2-Based Ceramic Tool Materials

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Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

Cited by 34 publications

References 32 publications

Medium‐temperature sintering efficiency of ZrB2 ceramics using polymer‐derived SiBCN as a sintering aid

Medium‐temperature sintering efficiency of ZrB2 ceramics using polymer‐derived SiBCN as a sintering aid

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Effects of HfB2 and HfN Additions on the Microstructures and Mechanical Properties of TiB2-Based Ceramic Tool Materials

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Medium‐temperature sintering efficiency of ZrB₂ ceramics using polymer‐derived SiBCN as a sintering aid

Medium‐temperature sintering efficiency of ZrB₂ ceramics using polymer‐derived SiBCN as a sintering aid