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Effect of thermo-mechanical properties of PIM feedstock on compacts shape retention during debinding process

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中国有色金属学会会刊：英文版 2001年第4期11卷 521-524页

作者： k.a.khalil 黄伯云李益民 State key Laboratory for Powder Metallurgy Central South University

The removal of the binder from the powder compacts (debinding) can be a slow step and a source of problems. To improve the debinding process of powder injection molding operation, it’s necessary to understand the thermal and mechanical properties of powder injection molding feedstocks and to find the major causes responsible for molding difficulties and compacts shape retention during debinding process. The effects of thermo mechanical properties of the PIM feedstock on the compacts shape retention during debinding process were discussed and explained from practical point of view. The results indicate that the heat of fusion affects the cooling time. The binder component with high heat of fusion and high decomposed temperature is more effective as the second binder component for the compact to retain its shape during debinding.

关键词： thermo mechanical properties shape retention debinding thermal stresses

Shape retention of injection molded stainless steel compacts

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Journal of Central South University of Technology 2005年第2期12卷 107-112页

作者：李益民 k.a.khalil 黄伯云 State key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083 China

The effects of the binder composition, the powder loading, the thermal properties of feedstocks, and the injection molding parameters on the compact shape retention for metal injection molding 17-4PH stainless steel were investigated. The high-density polyethylene is more effective than ethylene vinyl acetate as a second component of the wax-based binder to retain compact shape due to its higher pyrolytic temperature and less heat of fusion. The compact distortion decreases with increasing the powder loading, molding pressure and molding temperature. There exists an optimal process combination including the powder loading of 68%, molding pressure of 120MPa and molding temperature of 150℃. Under this process condition, the percentage of distorted compacts is the lowest.

关键词： injection molding shape retention stainless steel

金属注射成形17-4PH不锈钢脱脂保形性研究

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稀有金属材料与工程 2005年第1期34卷 22-27页

作者：李益民 k.a.khalil 黄伯云中南大学粉末冶金国家重点实验室湖南长沙410083

研究了粘结剂配方、粉末装载量、喂料热力学性质、注射成形工艺等多个因素对金属注射成形17-PH不锈钢脱脂保形性的影响。结果表明具有较高热分解温度、较低熔解热的HDPE作为第2组元的蜡基粘结剂,具有比采用EVA为第2组元的粘结剂更好的... 详细信息

研究了粘结剂配方、粉末装载量、喂料热力学性质、注射成形工艺等多个因素对金属注射成形17-PH不锈钢脱脂保形性的影响。结果表明具有较高热分解温度、较低熔解热的HDPE作为第2组元的蜡基粘结剂,具有比采用EVA为第2组元的粘结剂更好的保形性能。试样变形率随着粉末装载量、注射压力、注射温度的增加而下降,而且存在一最佳的工艺条件,包括粉末装载量、注射压力、注射温度,此时试样最不容易变形,试样变形比例最小。

关键词：金属注射成形(MIM) 保形性不锈钢

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金属注射成形17-4PH不锈钢的研究

粉末冶金技术 2005年第4期23卷 254-258页

作者：李益民 k. A. khalil 黄伯云中南大学粉末冶金重点实验室长沙410083

研究了17-4PH不锈钢的金属注射成形工艺及其流变学性能、力学性能、微观组织和耐腐蚀性能。结果表明:采用65%PW-30%EVA-5%SA粘结剂组成的注射料具有最好的综合流变学性能。在1 380℃保温90 min的烧结条件下,注射成形17-4PH不锈钢的力学... 详细信息

研究了17-4PH不锈钢的金属注射成形工艺及其流变学性能、力学性能、微观组织和耐腐蚀性能。结果表明:采用65%PW-30%EVA-5%SA粘结剂组成的注射料具有最好的综合流变学性能。在1 380℃保温90 min的烧结条件下,注射成形17-4PH不锈钢的力学性能最佳,孔隙分布均匀,晶粒尺寸适中。而保温60和120 min则分别表现出烧结不完全和过烧现象。1 380℃保温90 min烧结所得到的力学性能为ρ=7.70 g/cm3,σb=1 275 MPa,δ=5%,硬度36 HRC。注射成形17-4 PH不锈钢的密度、抗拉强度、硬度随着烧结温度的升高而提高,伸长率则随着烧结温度的升高而下降。17-4 PH不锈钢的耐蚀性好,腐蚀期长,具有活化-化金属极化曲线的特征,但钝化电位范围较窄,耐点蚀性能较差。

关键词：金属注射成形(MIM) 17—4PH不锈钢金属注射成形不锈钢流变学性能耐腐蚀性能注射成形工艺力学性能烧结条件烧结温度

Properties of Hot-Pressed Al_2O_3-Fe Composites

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Journal of Materials Science & Technology 2001年第5期17卷 538-542页

作者： M.M.El-Sayed Seleman, Xudong SUN and Liang ZUO Department of Materials Science and Engineering, Northeastern University, Shenyang 110006, China k.a.khalil Powder Metallurgy Institute, Central South University, Changsha 410083, China Northeastern Univ Dept Mat Sci & Engn Shenyang 110006 Peoples R China Cent S Univ Powder Met Inst Changsha 410083 Peoples R China

Alumina-(0 similar to 20 vol. pct) iron composites were fabricated by hot-pressing of well-mixed-alumina and iron powders at 1400 degreesC and 30 MPa for 30 min. Hot-pressed bodies with nearly theoretical density were obtained for addition up to 10 vol. pct Fe, but relative density decreased gradually with further increase in Fe addition. The materials exhibit a homogeneous dispersion of Fe. Fracture strength of the composites exhibits a maximum value of 604 MPa at 15 vol. pct Fe, which is 1.5 times that of alumina alone. Fracture toughness increases with the increase in Fe content, reaching 7.5 MPa.m(1/2) at 20 vol. pct Fe. The theoretical values of fracture toughness was calculated and compared with the experimental one. Toughening mechanisms of the composites are also discussed.

关键词： Fe Properties of Hot-Pressed Al2O3-Fe Composites Al

Secure Channel Estimation Using Norm Estimation Model for 5G Next Generation Wireless Networks

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Computers, Materials & Continua 2025年第1期82卷 1151-1169页

作者： khalil Ullah Song Jian Muhammad Naeem Ul Hassan Suliman khan Mohammad Babar Arshad Ahmad Shafiq Ahmad Faculty of Information Engineering and Automation Kunming University of Science and TechnologyKunming650500China Department of Computer Science Abbottabad University of Science and TechnologyHavelianAbbottabad22500Pakistan Department of Computing and Electronics Engineering Middle East CollegeMuscat124Oman Department of CS&IT Pak-Austria Fachhochschule Institute of Applied Sciences and Technology MangHaripur22621Pakistan Industrial Engineering Department College of EngineeringKing Saud UniversityRiyadh11421Saudi Arabia

The emergence of next generation networks(NextG),including 5G and beyond,is reshaping the technological landscape of cellular and mobile *** networks are sufficiently scaled to interconnect billions of users and *** in academia and industry are focusing on technological advancements to achieve highspeed transmission,cell planning,and latency reduction to facilitate emerging applications such as virtual reality,the metaverse,smart cities,smart health,and autonomous *** continuously improves its network functionality to support these *** input multiple output(MIMO)technology offers spectral efficiency,dependability,and overall performance in *** article proposes a secure channel estimation technique in MIMO topology using a norm-estimation model to provide comprehensive insights into protecting NextG network components against adversarial *** technique aims to create long-lasting and secure NextG networks using this extended *** viability of MIMO applications and modern AI-driven methodologies to combat cybersecurity threats are explored in this ***,the proposed model demonstrates high performance in terms of reliability and accuracy,with a 20%reduction in the MalOut-RealOut-Diff metric compared to existing state-of-the-art techniques.

关键词： Next generation networks massive mimo communication network artificial intelligence 5G adversarial attacks channel estimation information security

Correction:Deep Learning-Enhanced Brain Tumor Prediction via Entropy-Coded BPSO in CIELAB Color Space

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Computers, Materials & Continua 2025年第1期82卷 1461-1461页

作者： Mudassir khalil Muhammad Imran Sharif Ahmed Naeem Muhammad Umar Chaudhry Hafiz Tayyab Rauf Adham E.Ragab Department of Computer Engineering Bahauddin Zakariya UniversityMultan60000Pakistan Department of Computer Science Kansas State UniversityManhattanKS 66506USA Department of Computer Science University of Management and TechnologyLahore54000Pakistan Independent Researcher BradfordBD80HSUK Industrial Engineering Department Collage of EngineeringKing Saud UniversityP.O.Box 800Riyadh11421Saudi Arabia

In the article“Deep Learning-Enhanced Brain Tumor Prediction via Entropy-Coded BPSO in CIELAB Color Space”by Mudassir khalil,Muhammad Imran Sharif,Ahmed Naeem,Muhammad Umar Chaudhry,Hafiz Tayyab Rauf,Adham *** Computers,Materials&Continua,2023,Vol.77,No.2,pp.2031–***:10.32604/cmc.2023.043687,URL:https://***/cmc/v77n2/54831,there was an error regarding the affiliation for the author Hafiz Tayyab *** of“Centre for Smart Systems,AI and Cybersecurity,Staffordshire University,Stoke-on-Trent,ST42DE,Uk”,the affiliation should be“Independent Researcher,Bradford,BD80HS,Uk”.

关键词： Deep Code CIELAB

Processing and mechanical properties of porous 316L stainless steel for biomedical applications

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中国有色金属学会会刊：英文版 2007年第3期17卷 468-473页

作者： Montasser M. DEWIDAR khalil A. khalil J. k. LIM Department of Mechanical Design and Materials High Institute of Energy South Valley University Aswan Egypt Material and Fracture Laboratory Department of Mechanical Design Chonbuk National University Duckjin 1-664-14 Jeonju JB561-756 South Korea Department of Mechanical Design and Materials High Institute of Energy South Valley University Aswan Egypt Automobile Hi-Technology Research Institute Faculty of Mechanical and Aerospace System Engineering Chonbuk National University Duckjin 1-6 64-14 Jeonju JB 561-756 South Korea

Highly porous 316L stainless steel parts were produced by using a powder metallurgy process, which includes the selective laser sintering(SLS) and traditional sintering. Porous 316L stainless steel suitable for medical applications was successfully fabricated in the porosity range of 40%-50% (volume fraction) by controlling the SLS parameters and sintering behaviour. The porosity of the sintered compacts was investigated as a function of the SLS parameters and the furnace cycle. Compressive stress and elastic modulus of the 316L stainless steel material were determined. The compressive strength was found to be ranging from 21 to 32 MPa and corresponding elastic modulus ranging from 26 to 43 GPa. The present parts are promising for biomedical applications since the optimal porosity of implant materials for ingrowths of new-bone tissues is in the range of 20%-59% (volume fraction) and mechanical properties are matching with human bone.

关键词：不锈钢激光烧结处理方法金属

Robust Stabilization of Non-minimum Phase Switched Nonlinear Systems with Uncertainty

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Journal of Systems Science & Complexity 2020年第2期33卷 289-311页

作者： khalil Jouili Laboratory of Advanced Systems Polytechnic School of Tunisia(EPT) B.P.7432078 MarsaTunisia

This paper investigates the problem of robust stabilization of a class of switched nonlinear system with uncertain dynamics where each subsystem represents a non-minimum *** authors first construct a stabilizing sliding mode controller for each subsystem to stabilize individually its own unstable internal ***,a switching strategy is introduced to select the most appropriate diffeomorphism through an infinity of *** conditions are specifically given for the exponential stability and the exponential upper bound of the trajectory of the switched subsystem,which guarantees the global asymptotical stability of the resulting switched ***,the proposed control approach can improvemore the transient state,compared to a feedback linearization based on only one *** studies illustrate the effectiveness of the suggested approach.

关键词： Exponential stability sliding mode control switching control uncertain non-minimum phase systems