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Burning products of TA15 titanium alloy by friction oxygen concentration method

Rare Metals 2018年第11期37卷 952-960页

作者： Nan Sui guang-bao mi Meng-Qi Yan Jing-Xia Cao Xu Huang Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials

The microstructural characteristics, elemental distribution law and microscopic formation mechanism of the burning products of TA15 titanium alloy were investigated by friction oxygen concentration method, associated with in situ observation, X-ray diffraction(XRD),scanning electron microscopy(SEM) and energy-dispersive spectroscopy(EDS) analyses, providing the thoughts to improve fireproof property. The results show that, when the friction contact pressure(p) is 0.20 MPa and oxygen concentration of premixed air flow(c) is 60 vol%, TA15 titanium alloy produces violent sparks and presents dazzling white light during combustion. The generated products after burning are mainly TiOand small amount of AlOoxides. Four distinct zones form from the combustion surface to the alloy matrix, and they are in the sequence of combustion zone, fusion zone, heat-affected zone and transition zone. Further, combustion zone is composed of TiOand A1203 compounds, containing obvious cracks. In the fusion zone, discontinuous oxygenrich Al-based solid solution forms, and the elemental distribution has strong volatility. In the heat-affected zone,there are abundant of Ti-based solid solution and small amount of Al-and Mo-based solid solution. Transition zone is made of lamellar structure. Two technical approaches are given to prevent oxygen diffusion inside the reaction zone and reaction-affected zone. On the one hand,the content of Al is designed as the upper limit of alloy composition; on the other hand, fireproof coatings are deposited on the surface of the alloy.

关键词： Friction oxygen concentration method TA15 titanium alloy Burning products microstructure Titanium fire

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Frictional ignition of Ti40 fireproof titanium alloys for aero-engine in oxygen-containing media

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Transactions of Nonferrous Metals Society of China 2013年第8期23卷 2270-2275页

作者：弭光宝黄旭曹京霞曹春晓黄秀松北京航空材料研究院先进钛合金航空科技重点实验室北京100095 清华大学新材料国际研发中心北京100084

The effect of friction pressure p and oxygen concentration xo on the fireproof performance of Ti40 titanium alloy was studied by frictional ignition test, the U--Xo relationship quantitatively describing the fireproof performance of Ti40 was established and the fireproof mechanism of Ti40 was analyzed by SEM, XRD and EDS. The results show that the p--xo relationship of Ti40 obeys parabolic rule. The varying range of xo is about 25% while p varies within 0.1-0.25 MPa. When Xo is 〉70%, Ti40 is ignited immediately at room temperature and develops into continual and steady burning, and the duration of burning is more than 10 s. The fireproof performance of Ti40 is better than TC4 while xo of Ti40 is at least 40% higher than TC4. When Xo is low, the fireproof performance of Ti40 is more sensitive to p; when Xo increases, it is more sensitive to Xo. The forming of fused oxides of V205, TiO2 and Cr203 with strong inner interaction during friction is the basic reason of high fireproof performance of Ti40.

关键词： Ti40 fireproof titanium alloys fireproof performance fused oxides fireproof mechanism titanium fire

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A Qualitative Analysis of Channel Wave Functions and Widths of the Low-lying States of ^(6)Li

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Chinese Physics Letters 2000年第1期17卷 10-12页

作者： bao Cheng-guang Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Department of Physics Zhongshan UniversityGuangzhou 510275

The structure of the channel wave functions of 6Li is studied *** is found that the widths of the low-lying resonances can be in general explained by using shell model wave ***,the width of the 3^(+) state is narrower than that anticipated by the shell modelf thus there is a room for the existence of other physical pictures to describe the very light nuclei.

关键词： functions wave narrow

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Inherent Nodal Structures in Doubly-Excited Intrashell States of Atoms

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Chinese Physics Letters 1999年第3期16卷 178-180页

作者： bao Cheng-guang Department of Physics Zhongshan UniversityGuangzhou 510275

Quantum mechanical systems are strongly constrained by ***,inherent nodal surfaces are imposed on the wave *** this paper,the inherent nodal surfaces existing in the doubly-excited intrashell states of atoms have been... 详细信息

关键词： functions. surfaces states

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Background of Existence of the Two Low-Lying Adjacent 4^(+) Narrow Resonances in ^(16)O Nucleus and Other 4-Boson Systems

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Chinese Physics Letters 2001年第5期18卷 638-640页

作者： bao Cheng-guang Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Department of Physics Zhongshan UniversityGuangzhou 510275

Based on an analysis of the inherent nodal structures of wave functions of 4-boson systems,we found that the internal energy of the 4_(1)^(+) state should be lower because its structure can be optimized without suffering a strong constraint arising from symmetry(while other 1≤L≤3 states suffer from this kind of constraints).Furthermore,two superior structures favorable in binding are found to be allowed to be possessed by 4^(+) *** findings would lead to the appearance of two adjacent 4^(+) states,as a common feature,in the low-lying spectra of 4 boson systems.

关键词： allowed Existence symmetry

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Bose-Einstein Condensation in a Two-Dimensional System with Sixty Bosons

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Chinese Physics Letters 2000年第2期17卷 123-125页

作者： bao Cheng-guang Department of Physics Zhongshan UniversityGuangzhou 510275

A 60-boson system confined on a sphere has been qualitatively studied based on symmetry considerations. The low-lying spectrum is dominated by the ground rotation band based on the fullerene structure. In this band all the L=1 to L=5 states are found to be prohibited by symmetry. Therefore, there is a large gap lying between the ground state and the first excited state. The magnitude of this gap, which is associated with the critical temperature of Bose-Einstein condensation, has been evaluated. It is found that, the smaller the radius of the sphere of confinement, the higher the critical temperature.

关键词： temperature structure state.

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Analysis of the Low-Lying Spectra of Five-Nucleon Systems

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Chinese Physics Letters 2000年第7期17卷 485-487页

作者： bao Cheng-guang Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Department of Physics Zhongshan UniversityGuangzhou 510275(mailing address)

The wavefunctions are decomposed into components. The inherent nodal structure and the stability of these components are investigated. It is assumed that the low-lying states would be dominated by the components without inherent nodal surfaces. Based on this assumption, the composition of the wave functions of the low-lying states of 5He has been suggested and the qualitative feature of the spectrum has been explained.

关键词： nodal assumed qualitative

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Inherent Nodal Structures of the Wavefunctions of a 4-Boson System

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Chinese Physics Letters 1997年第1期14卷 20-23页

作者： bao Cheng-guang Department of Physics Zhongshan UniversityGuangzhou 510275

The effect of a kind of nodal surfaces originated from the inherent symmetry on a 4-boson system has been *** was found that these surfaces determine the accessibility of specific geometric structures.

关键词： surfaces symmetry system

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Pointwise A Priori Estimates for Solutions to Some p-Laplacian Equations

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Acta Mathematica Sinica,English Series 2022年第12期38卷 2150-2162页

作者： Xiao Qiang SUN Ji guang bao School of Mathematics Sun Yat-sen UniversityGuangzhou 510275P.R.China School of Mathematical Sciences Beijing Normal UniversityLaboratory of Mathematics and Complex SystemsMinistry of EducationBeijing 100875P.R.China

In this article,we apply blow-up analysis to study pointwise a priori estimates for some p-Laplacian equations based on Liouville type *** newly developed analysis techniques,we first extend the classical results of interior gradient estimates for the harmonic function to that for the p-harmonic function,i.e.,the solution ofΔpu=0,x∈Ω.We then obtain singularity and decay estimates of the sign-changing solution of Lane-Emden-Fowler type p-Laplacian equation-Δp^(u)=|u|^(λ-1)u,x∈Ω,which are then extended to the equation with general right hand term f(x,u)with certain asymptotic *** addition,point wise estimates for higher order derivatives of the solution to Lane-Emden type p-Laplacian equation,in a case of p=2,are also discussed.

关键词： Priori estimates Blow-up analysis p-Laplacian

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Alpha-Chain Structure of ^(12)C

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Chinese Physics Letters 1996年第7期13卷 516-519页

作者： XIE Wen-fang bao Cheng-guang Department of Physics Guangdong University of TechnologyGuangzhou 510090 CCAST(World Laboratory)P.O.Box 8730Beijing 100080 Department of Physics Zhongshan UniversityGuangzhou 510275

Alpha-chain states in ^(12)C are studied via an analysis of underlying quantum mechanical *** is pointed out that the linear chain band exists undoubting in ^(12)***,the pure linear chain structure does not exist in ^... 详细信息

关键词： symmetry triangle

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