首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
碳化硅晶须改性反应烧结碳化硅陶瓷的显微结构及性能
作者:田贵山1 李双2 谢志鹏2 
单位:1.山东理工大学资源与环境工程学院 山东 淄博 255049  2.清华大学材料学院  新型陶瓷与精细工艺国家重点实验室 北京 100084 
关键词:反应烧结 晶须 力学性能 游离硅 氧化 
分类号:TB332
出版年,卷(期):页码:2014,42(12):1520-1527
DOI:10.7521/j.issn.0454-5648. 2014. 12.08
摘要:

 以碳化硅晶须为增强体、碳化硅­­碳为基体制备晶须增强反应烧结碳化硅复合材料,研究了碳化硅晶须、碳含量对复合材料显微结构与性能的影响。结果表明:碳化硅晶须经高温反应烧结后仍保持表面的竹节结构,且晶须增强体与反应烧结碳化硅基体间形成适中的界面结合强度;材料断口处有明显的晶须拔出,当碳黑含量为6%(质量分数)时,随着晶须含量的增加,材料的抗弯强度从200 MPa提高到310 MPa(晶须含量15%),当碳黑含量为18%时,随着晶须含量的增加,材料断裂韧性从3.3 MPa·m1/2提高到4.3 MPa·m1/2;碳化硅晶须含量过高时,晶须的“搭桥”效应导致材料中含有较多的游离硅,限制了材料力学性能进一步提高;微氧化处理使材料表面形成致密、均匀的氧化膜,可显著提高反应烧结碳化硅的抗弯强度和断裂韧性。

 
online want my wife to cheat married woman looking to cheat
my husband cheated on me click here women who cheat on husband
why married men cheat on their wives women cheat on men

A composite of reaction bonded silicon carbide (RBSC) reinforced with silicon carbide whisker was prepared. The effects of the whisker and carbon on the microstructure and mechanical behavior were investigated. The whisker maintains the burl profile on the surface after reactive sintering. Some whisker pullouts occur on the fracture surface, indicating an appropriate bonding strength between the whisker and the RBSC matrix. For the composite with 6% (mass fraction) of carbon, the flexural strength increases from 200 MPa to 310 MPa at a whisker fraction of 15%, and for the composite with 18% of carbon, the fracture toughness increases from 3.3 MPa·m1/2 to 4.3 MPa·m1/2 at a whisker fraction of 20%. Some pores in the green body appear when the whisker fraction further increases due to the bridging effect of whisker, giving rise to residual silicon in the sintered body. A protective film is formed on the material surface due to mild oxidation in ambient air. The flexural strength and fracture toughness both are improved in the presence of this film. 

redirect i dreamed my wife cheated on me unfaithful husband
read wifes cheat reasons wives cheat on their husbands
why married men cheat on their wives reasons wives cheat on husbands women cheat on men
基金项目:
作者简介:
第一作者:田贵山(1963—),男,博士,教授。 通信作者:李 双(1981—),男,博士。
how do i know if my wife has cheated men having affairs read
why do wife cheat on husband why men cheat how to cheat wife
my wife cheated on me now what i dream my husband cheated on me husband cheat
bystolic copay card bystolic coupon voucher
参考文献:

 参考文献:

[1] LEE S H, LE Y I, KIM Y W, et al. Mechanical properties of hot­forged silicon carbide ceramics [J]. Scripta Mater, 2005, 52(2): 153­156.
[2] ZHOU Y, HIRAO K, YAMAICHI Y, et al. Tailoring the mechanical properties of silicon carbide ceramics by modification of the intergranular phase chemistry and microstructure [J]. J Eur Ceram Soc, 2002, 22(14/15): 2689­2696.
[3] BAUD S, THEVENOT F. Microstructures and mechanical properties of liquid­phase sintered seeded silicon carbide [J]. Mater Chem Phys, 2001, 67(1/3): 165­174.
[4] 谢志鹏. 结构陶瓷 [M]. 北京: 清华大学出版社, 2011: 469­485.
 [5] 岳建设, 王红杰, 乔冠军. 反应烧结制备多孔β­SiAlON [J]. 硅酸盐学报, 2012, 40(4): 489­492.
   YUE J S, WANG H J, QIAO G J. J Chin Ceram Soc, 2012, 40(4): 489­492.
[6] ZHANG X F, YANG Q, JONGHE L C. Microstructure development in hot­pressed silicon carbide: effects of aluminum, boron, and carbon additives [J]. Acta Mater, 2003, 51(13): 3849­3860.
[7] LEE J K, PARK J G, LEE E G, et al. Effect of starting phase on microstructure and fracture toughness of hot­pressed silicon carbide [J]. Mater Lett, 2002, 57(1): 203­208.
[8] NESS J N, PAGE T F. Microstructural evolution in reaction­bonded silicon carbide [J]. J Mater Sci, 1986, 21(4): 1377­1397.
[9] LIM C B, ISEKI T. Strength variations of reaction­sintered SiC heterogeneously containing fine­grained β­SiC [J]. J Mater Sci, 1988, 23(9): 3248­3253.
[10] LAMON J. A micromechanics­based approach to the mechanical behavior of brittle­matrix composites [J]. Compos Sci Technol, 61(15): 2259­2272.
[11] MARGIOTTA J C, ZHANG D, NAGLE D C. Microstructural evolution during silicon carbide (SiC) formation by liquid silicon infiltration using optical microscopy [J]. Int J Refract Met H, 2010, 28(2): 191­197.
[12] LEMARCHAND A, BONNET J P. Modelling silicon carbide formation during heating at constant rate [J]. J Eur Ceram Soc, 2006, 26(12): 2389­2396.
[13] YAN J, ZHANG Z, KURIYAGAWA T. Mechanism for material removal in diamond turning of reaction­bonded silicon carbide [J]. Int J Mach Tool Manu, 2009, 49(5): 366­374.
[14] ODESHI A G, MUCHA H, WIELAGE B. Manufacture and characterisation of a low cost carbon fibre reinforced C/SiC dual matrix composite [J]. Carbon, 2006, 44(10): 1994­2001.
[15] HE X L, GUO Y K, ZHOU Y U, et al. Microstructures of short­carbon­fiber­reinforced SiC composites prepared by hot­pressing [J]. Mater Charact, 2008, 59(12): 1771­1775.
[16] ZHANG Y M, LI S, HAN J C, et al. Fabrication and characterization of random chopped fiber reinforced reaction bonded silicon carbide composite [J]. Ceram Int, 2012, 38(2): 1261­1266.
[17] LI S, ZHANG Y M, HAN J C, et al. Effect of carbon particle and carbon fiber on the microstructure and mechanical properties of short fiber reinforced reaction bonded silicon carbide composite [J]. J Eur Ceram Soc, 2013, 33(4): 887­896.
married cheaters how many women cheat click
online want my wife to cheat married woman looking to cheat
read cheat on husband signs of infidelity
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com