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电感耦合等离子体原子发射光谱法测定碳化硅中杂质元素姚永生1(1.河南省安阳市河南省有色金属地质矿产局第一地质大队)摘 要:提出了使用电感耦合等离子体原子发射光谱同时测定碳化硅中微量Fe,Al,Ti,Ca,Mg,P,Mn的分析方法.样品用无水碳酸钠与硼酸混合熔剂熔融,硝酸提取,甲醇除硼,氢氟酸挥硅,然后在选定的仪器工作条件下测定.使用基体匹配法来校正基体的干扰.各元素的测定检出限为0.001~0.054μg/mL,相对标准偏差(RSD,n=9)为0.5%~3.7%.经比对试验证明,本法测定值与其他方法测定值相符合......
): 18-23.[2]Jorge S, Chung D L, Martinez M, et al. Effect of boron carbide particle addition on thermomechanical behavior of carbon matrix silicon carbide particle composites[J]. Carbon, 2003, 41(5...化硼 中图分类号:O627 文献标识码:A 文章编号: 1672-7207(2005)03-0448-04 Synthesis of trialkyboranes by ultrasound wave method andpreparation of boron carbide by thermal decomposition method ZHANG Hong-ping1, TANG......
氢气气氛下SiC纤维的热稳定性 王华1,张云鹏1,孙博1 (1.西安理工大学,材料学院,西安,710048;2.陕西理工学院,陕西,汉中,723003) 摘要:采用XRD和扫描电镜等分析方法,对国产SiC纤维进行氢气气氛下除去游离碳及纤维高温稳定性的实验研究.在氢气气氛下,将国产SiC纤维分别在900,1200,1500℃和1800℃保温4h,随着温度的升高,纤维质量不断流失,同时纤维结构遭到破坏, 但β-SiC晶化转变不明显,表明国产纤维存在较多的因氧的介入所形成的Si-O-C键,从而影响了纤维在氢气气氛下的高温稳定性. 关键词:碳化硅纤维; 氢气; 晶化; 热稳定性; silicon carbide fiber; hydrogen; crystallization; thermal stability; [全文内容正在添加中] ......
: 898-901. [9] ZHU S, FAHRENHOLTZ W G, HILMAS G E. Influence of silicon carbide particle size on the microstructure and mechanical properties of zirconium diboride-silicon carbide ceramics[J]. Journal...; 文献标志码:A Synthesis of nano-sized SiC-ZrB2 ceramic powder mixture by boro-carbothermal reduction method ZHANG Zhao-fu, SHA Jian-jun, WANG Yong-chang, DAI Ji-xiang, LI Jian......
Thermal conductivity and mechanical properties of high density polyethylene composites filled with silicon carbide whiskers modified by cross-linked poly(vinyl alcohol)Jiaming Fan1,Shiai Xu1,21... of poly(vinyl alcohol)(PVA) was coated on the surface of silicon carbide whiskers(SCWs)and crosslinked by glutaraldehyde, and then these modified whiskers(mSCWs) were incorporated into high density......
; Abstract: Grain evolution of boron carbide ceramic powder during isothermal sintering process was in situ investigated by synchrotron radiation... sintering. Grain evolution of loose boron carbide ceramic powder during isothermal sintering process was in situ investigated by SR-CT technique. The projection images of the sample were obtained......
Magneli phase titanium sub-oxide conductive ceramic TinO2n-1 as support for electrocatalyst toward oxygen reduction reaction with high activity and stabilityWU Qiu-mei(伍秋美)1, RUAN Jian-ming(阮建明)1... South University, Changsha 410083, China)Abstract:Magneli phase titanium sub-oxide conductive ceramic TinO2n-1 was used as the support for Pt due to its excellent resistance to electrochemical oxidation......
by powder metallurgy route or liquid metallurgy route. These micro-balloons are generally selected from either silicon carbide or aluminum oxide which have high strength and can withstand high compaction...Trans. Nonferrous Met. Soc. China 24(2014) 89-99 Titanium cenosphere syntactic foam with coarser cenosphere fabricated by powder metallurgy at lower compaction load N. JHA1, D. P. MONDAL1, M. D......
: SiCp/Al MMCs; plasma arc welding; in-situ weld-alloying; aluminum carbide; titanium nitrogen; aluminum nitrogen ...) indicates that the fine particles are titanium nitride, aluminum nitride and titanium carbide. Fig.6 XRD pattern of welded joint with 0.4 mm thick titanium filler plate In the transition zone between......
with various volume fractions of ceramic particles. Recent literatures showed that laser melting of powder mixture containing carbon and carbide-forming elements, was fa-vorable for the formation...Laser cladding in-situ carbide particle reinforced Fe-based composite coatings with rare earth oxide addition WU Chaofeng1,ZHANG Weiming1,LIU Wenjin1,ZHANG hongjun1,ZHONG Minlin1,MA Mingxing1......
