Enhanced mechanical properties and thermal shock resistance of Si_2BC_3N ceramics with SiC coated MWCNTs
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摘要
Bulk Si_2 BC_3 N ceramics were reinforced with SiC coated multi-walled carbon nanotubes(MWCNTs). The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si_2 BC_3 N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength(532.1 MPa) and fracture toughness(6.66 MPa m1/2). Besides, the 2 vol% SiC coated MWCNTs reinforced Si_2 BC_3 N ceramics maintains much higher residual strength(193.0 MPa) after thermal shock test at 1000 ℃.The enhanced properties should be attributed to:(1) the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation;(2) the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the "pull out" of MWCNTs.
Bulk Si_2 BC_3 N ceramics were reinforced with SiC coated multi-walled carbon nanotubes(MWCNTs). The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si_2 BC_3 N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength(532.1 MPa) and fracture toughness(6.66 MPa m1/2). Besides, the 2 vol% SiC coated MWCNTs reinforced Si_2 BC_3 N ceramics maintains much higher residual strength(193.0 MPa) after thermal shock test at 1000 ℃.The enhanced properties should be attributed to:(1) the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation;(2) the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the "pull out" of MWCNTs.
Bulk Si_2 BC_3 N ceramics were reinforced with SiC coated multi-walled carbon nanotubes(MWCNTs). The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si_2 BC_3 N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength(532.1 MPa) and fracture toughness(6.66 MPa m1/2). Besides, the 2 vol% SiC coated MWCNTs reinforced Si_2 BC_3 N ceramics maintains much higher residual strength(193.0 MPa) after thermal shock test at 1000 ℃.The enhanced properties should be attributed to:(1) the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation;(2) the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the "pull out" of MWCNTs.
引文
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[33]Nguyen VL,Zera E,Perolo A,et al.Synthesis and characterization of polymer-derived Si CN aerogel.J Eur Ceram Soc 2015,35:3295-3302.
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[2]Tavakoli AH,Gerstel P,Golczewski JA,et al.Effect of boron on the crystallization of amorphous Si-(B-)C-Npolymer-derived ceramics.J Non-Cryst Solids 2009,355:2381-2389.
[3]Schiavon MA,SorarùGD,Yoshida IVP.Poly(borosilazanes)as precursors of Si-B-C-N glasses:synthesis and high temperature properties.J Non-Cryst Solids 2004,348:156-161.
[4]Jia DC,Liang B,Yang ZH,et al.Metastable Si-B-C-Nceramics and their matrix composites developed by inorganic route based on mechanical alloying:fabrication,microstructures,properties and their relevant basic scientific issues.Prog Mater Sci 2018,98:1-67.
[5]Yang ZH,Jia DC,Duan XM,et al.Effect of Si/C ratio and their content on the microstructure and properties of Si-B-C-N Ceramics prepared by spark plasma sintering techniques.Mat Sci Eng A 2011,528:1944-1948.
[6]Zhang PF,Jia DC,Yang ZH,et al.Progress of a novel non-oxide Si-B-C-N ceramic and its matrix composites.JAdv Ceram 2012,1:157-178.
[7]Wang JY,Duan XM,Yang ZH,et al.Ablation mechanism and properties of Si Cf/Si BCN ceramic composites under an oxyacetylene torch environment.Corros Sci 2014,82:101-107.
[8]Miao Y,Yang ZH,Zhu QS,et al.Thermal ablation behavior of Si BCN-Zr composites prepared by reactive spark plasma sintering.Ceram Int 2017,43:7978-7983.
[9]Miao Y,Yang ZH,Rao JC,et al.Influence of sol-gel derived Zr B2 additions on microstructure and mechanical properties of Si BCN composites.Ceram Int 2017,43:4372-4378.
[10]Zhang PF,Yang B,Lu Z,et al.Effect of Al N and Zr O2 on the microstructure and property of the 2Si-B-3C-Nceramic.Ceram Int 2018,44:3406-3411.
[11]Li DX,Yang ZH,Jia DC,et al.Preparation,microstructures,mechanical properties and oxidation resistance of Si BCN/Zr B2-Zr N ceramics by reactive hot pressing.J Eur Ceram Soc 2015,35:4399-4410.
[12]Ye D,Jia DC,Yang ZH,et al.Microstructures and mechanical properties of Si BCNAl ceramics produced by mechanical alloying and subsequent hot pressing.JZhejiang Univ Sci A 2010,11:761-765.
[13]Liao N,Jia DC,Yang ZH,et al.Enhanced mechanical properties,thermal shock resistance and oxidation resistance of Si2BC3N ceramics with Zr-Al addition.Mat Sci Eng A2018,725:364-374.
[14]Liang B,Yang ZH,Jia DC,et al.Densification,microstructural evolution and mechanical properties of Si-B-C-N monoliths with La B6 addition.J Alloys Compd2017,696:1090-1095.
[15]Liang B,Yang ZH,Miao Y,et al.Microstructural evolution,mechanical and thermal properties of La B6 embedded in Si-B-C-N prepared by spark plasma sintering.Ceram Int2017,43:4814-4820.
[16]Liang B,Yang ZH,Li YT,Yuan,et al.Ablation behavior and mechanism of Si Cf/Cf/Si BCN ceramic composites with improved thermal shock resistance under oxyacetylene combustion flow.Ceram Int 2015,41:8868-8877.
[17]Li DX,Wu DX,Yang ZH,et al.Effects of in situ amorphous graphite coating on ablation resistance of Si Cfiber reinforced Si BCN ceramics in an oxyacetylene flame.Corros Sci 2016,113:31-45.
[18]Wang JY,Yang ZH,Duan XM,et al.Microstructure and mechanical properties of Si Cf/Si BCN ceramic matrix composites.J Adv Ceram 2015,4:31-38.
[19]Liao N,Jia DC,Yang ZH,et al.Strengthening and toughening effects of MWCNTs on Si2BC3N ceramics sintered by SPStechnique.Mat Sci Eng A 2017,710:142-150.
[20]Liao N,Jia DC,Yang ZH,et al.Enhanced thermal shock and oxidation resistance of Si2BC3N ceramics through MWCNTs incorporation.J Adv Ceram 2018,7:276-288.
[21]Li DX,Yang ZH,Jia DC,et al.Microstructure,oxidation and thermal shock resistance of graphene reinforced Si BCN ceramics.Ceram Int 2016,42:4429-4444.
[22]Li DX,Yang ZH,Jia DC,et al.Spark plasma sintering and toughening of graphene platelets reinforced Si BCNnanocomposites.Ceram Int 2015,41:10755-10765.
[23]Liao N,Jia DC,Yang ZH,et al.Mechanical properties and thermal shock resistance of Si2BC3N ceramics with ternary Al4Si C4 additive.Ceram Int 2018,44:9009-9017.
[24]Luo M,Li YW,Jin SL,et al.Oxidation resistance of multiwalled carbon nanotubes coated with polycarbosilanederived Si Cx Oy ceramic.Ceram Int 2011,37:3055-3062.
[25]Taguchi T,Igawa N,Yamamoto H,et al.Preparation and characterization of single-phase Si C nanotubes and C-Si Ccoaxial nanotubes.Physica E 2005,28:431-438.
[26]Zhou D,Seraphin S.Production of silicon carbide whiskers from carbon nanoclusters.Chem Phys Lett 1994,222:233-238.
[27]Morisada Y,Maeda M,Shibayanagi T,et al.Oxidation resistance of multi-walled carbon nanotubes coated with silicon carbide.J Am Ceram Soc 2004,87:804-808.
[28]Morisada Y,Miyamoto Y.Si C-coated carbon nanotubes and their application as reinforcements for cemented carbides.Mat Sci Eng A 2004,381:57-61.
[29]Morisada Y,Miyamoto Y,Takaura Y,et al.Mechanical properties of Si C composites incorporating Si C-coated multi-walled carbon nanotubes.Int J Refract Met H 2007,25:322-327.
[30]Song N,Liu H,Fang JZ.Fabrication and mechanical properties of multi-walled carbon nanotube reinforced reaction bonded silicon carbide composites.Ceram Int2016,42:351-356.
[31]Liu J,Qiao YL,Zhang P,et al.Synthesis of Si C ceramics from polysilazane by laser pyrolysis.Surf Coat Technol2017,321:491-495.
[32]Günthner M,Wang K,Bordia RK,et al.Conversion behaviour and resulting mechanical properties of polysilazanebased coatings.J Eur Ceram Soc 2012,32:1883-1892.
[33]Nguyen VL,Zera E,Perolo A,et al.Synthesis and characterization of polymer-derived Si CN aerogel.J Eur Ceram Soc 2015,35:3295-3302.
[34]Zera E,Nickel W,Kaskel S,et al.Out-of-furnace oxidation of Si CN polymer-derived ceramic aerogel pyrolized at intermediate temperature(600-800℃).J Eur Ceram Soc2016,36:423-428.