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Effect of CuO addition on microstructure and properties of aluminum composites produced by quick spontaneous infiltration process

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China Foundry 2014年第3期11卷 191-196页

作者： Zhang Jingjing lee jung-moo Cho Young-Hee Kim Su-Hyeon Yu Huashun Key Laboratory of Liquid Structure and Heredity of Materials Ministry of Education Shandong University Light Metal Division Korea Institute of Materials Science

Al matrix composites with a high volume fraction of reinforcements were fabricated with a compact of Al-Ti-B4C powder mixtures by quick spontaneous infiltration(QSI) process in an aluminum melt. Given the exothermal nature of the reaction between CuO and Al, a certain amount of CuO addition to the Al-Ti-B4C system dramatically increases the adiabatic temperature and thereby enables the complete combustion reaction in an aluminum melt(about 1,173 K). After the QSI process, the compact fabricated with CuO retains its original shape and the obtained composite exhibits sound microstructure containing reaction products of TiB2, Al3BC and B4C. The formation of such reinforcements when adding CuO contributes to enhancing the properties of the composites that show far superior hardness and elastic modulus of 3.03 GPa and 158.9 GPa, respectively, with lower coefficient of thermal expansion(9.44 ppm?K-1) compared to those with no CuO addition.

关键词： Al composite CuO addition Al-Ti-B4C microstructure mechanical properties

热处理工艺对A356/SiCp性能及干滑动摩擦磨损特性的影响

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中国有色金属学报 2008年第8期18卷 1458-1465页

作者：金云学 lee jung-moo KANG Suk-bong 江苏科技大学先进焊接技术省级重点实验室镇江212003 Advanced Materials Division Korea Institute of Machinery and Materials Changwon 641-010 Korea

研究分析热处理工艺对A356/SiCp复合材料的硬度、导电率及微观组织的影响,在此基础上研究复合材料的干滑动摩擦磨损特性。结果表明:固溶和T6热处理可显著提高复合材料的硬度,但降低导电率,而低温退火却比较显著地提高导电率;导电率高的... 详细信息

研究分析热处理工艺对A356/SiCp复合材料的硬度、导电率及微观组织的影响,在此基础上研究复合材料的干滑动摩擦磨损特性。结果表明:固溶和T6热处理可显著提高复合材料的硬度,但降低导电率,而低温退火却比较显著地提高导电率;导电率高的低温退火态磨损特性基本与铸态一致,固溶处理及时效处理虽可有效提高硬度,但不提高耐磨性能,这表明T6热处理是否作为制动盘材料时的最佳热处理工艺,有待进一步研究;复合材料的磨损率随载荷的增加而增加,但低载荷时增加缓慢,高载荷时增加迅速;摩擦因数随着热处理工艺而变化,但对载荷变化不敏感,都在较小的范围内波动,基本是稳定的。

关键词： Al/SiCp 复合材料干摩擦热处理摩擦磨损特性

Minimally invasive radical pancreatectomy for left-sided pancreatic cancer:Current status and future perspectives

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World Journal of Gastroenterology 2014年第9期20卷 2343-2351页

作者： Chang moo Kang Sung Hwan lee Woo jung lee Department of Surgery Yonsei University College of Medicine Seoul 120-752 South Korea Pancreaticobiliary Cancer Clinic Institute of Gastroenterology Severance Hospital Seoul 120-752 South Korea

Minimally invasive distal pancreatectomy with splenectomy has been regarded as a safe and effective treatment for benign and borderline malignant pancreatic ***,its application for left-sided pancreatic cancer is still being *** clinical evidence for radical antegrade modular pancreatosplenectomy(RAMPS)-based minimally invasive approaches for leftsided pancreatic cancer was *** indications and surgical concepts for minimally invasive RAMPS were *** the limited clinical evidence for minimally invasive distal pancreatectomy in left-sided pancreatic cancer,the currently available clinical evidence supports the use of laparoscopic distal pancreatectomy under oncologic principles in wellselected left sided pancreatic cancers.A pancreasconfined tumor with an intact fascia layer between the pancreas and left adrenal gland/kidney positioned more than 1 or 2 cm away from the celiac axis is thought to constitute a good condition for the use of margin-negative minimally invasive *** use of minimally invasive(laparoscopic or robotic)anterior RAMPS is feasible and safe for margin-negative resection in wellselected left-sided pancreatic *** oncologic feasibility of the procedure remains to be determined;however,the currently available interim results indicate that even oncologic outcomes will not be inferior to those of open radical distal pancreatosplenectomy.

关键词： Pancreatic cancer Laparoscopic pancreatectomy Robotic pancreatectomy

Dry Sliding Friction and Wear Properties and Wear Mechanism of SiC_P/Al Composites

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Journal of Wuhan University of Technology(Materials Science) 2009年第S1期24卷 24-28页

作者：金云学 Provincial Key Llaboratory of Advanced Welding Technology Jiangsu University of Science & Technology

Dry sliding friction and wear properties of A356/SiC composites against AISI D2 were analyzed by means of SEM,XRD and *** indicated that the wear rate of A356/SiC increased with increase of the applied *** wear took place under lower load,transferring to severe wear at the load heavier than 400 *** mixed layer(MML) formed on worn surface during dry sliding friction process,whose thickness became deeper with increasing *** formed easily in MML and spread transversely,resulting in peeling *** wear mechanism of the composite is that oxidation wear mechanism was dominant under low load,with the formation of tiny powdery *** the load enhanced,peeling wear was primary due to laminar debris detached from the MML,including oxidation and adhesive wear at the same time,with the load at 350-450 N,adhesive wear with irregular debris and peeling wear were predominant.

关键词： A356/SiC dry friction wear mechanism wear property

Minimally invasive vs open pancreatectomy for nonfunctioning pancreatic neuroendocrine tumors

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World Journal of Gastrointestinal Oncology 2020年第10期12卷 1133-1145页

作者： Juwan Kim Ho Kyoung Hwang Woo jung lee Chang moo Kang Department of Surgery Yonsei University College of MedicineSeoul 03722South Korea

BACKGROUND The mainstay of treating nonfunctioning-pancreatic neuroendocrine tumors(NFPNETs)is surgical ***,minimally invasive approaches to pancreatic resection for treating NF-PNETs are not widely accepted,and the longterm oncological outcomes of such approaches remain *** To determine the short-and long-term outcomes of minimally invasive pancreatic resection conducted in patients with *** Prospective databases from Severance Hospital were searched for 110 patients who underwent curative resection for NF-PNETs between January 2003 and August *** The proportion of minimally invasive surgery(MIS)procedures performed for NF-PNET increased to more than 75%after *** was no significant difference in post-operative complications(P=0.654),including pancreatic fistula(P=0.890)and delayed gastric emptying(P=0.652),between MIS and open *** statistically significant difference was found in disease-free survival between the open approach group and the MIS group(median follow-up period,28.1 mo;P=0.428).In addition,the surgical approach(MIS vs open)was not found to be an independent prognostic factor in treating NF-PNET patients[Exp(β)=1.062;P=0.929].CONCLUSION Regardless of the type of surgery,a minimally invasive approach can be safe and feasible for select NF-PNET patients.

关键词： Nonfunctioning-pancreas neuroendocrine tumor Pancreatic neuroendocrine tumor Minimally invasive surgery Oncologic outcome Laparoscopic pancreaticoduodenectomy Laparoscopic distal pancreatectomy

Preoperative defining system for pancreatic head cancer considering surgical resection

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World Journal of Gastroenterology 2016年第26期22卷 6076-6082页

作者： Seok Jeong Yang Ho Kyoung Hwang Chang moo Kang Woo jung lee Department of Surgery Ulsan University Hospital University of Ulsan College of Medicine Department of Hepatobiliary and Pancreatic Surgery Yonsei University College of Medicine Pancreaticobiliary Cancer Clinic Yonsei Cancer Center Institute of Gastroenterology Yonsei Severance Hospital

AIM: To provide appropriate treatment, it is crucial to share the clinical status of pancreas head cancer among multidisciplinary treatment ***: A retrospective analysis of the medical records of 113 patients who underwent surgery for pancreas head cancer from January 2008 to December 2012 was performed. We developed preoperative defining system of pancreatic head cancer by describing “resectability - tumor location - vascular relationship - adjacent organ involvement - preoperative CA19-9 (initial bilirubin level) - vascular anomaly”. The oncologic correlations with this reporting system were ***: Among 113 patients, there were 75 patients (66.4%) with resectable, 34 patients (30.1%) with borderline resectable, and 4 patients (3.5%) with locally advanced pancreatic cancer. Mean disease-free survival was 24.8 mo (95%CI: 19.6-30.1) with a 5-year disease-free survival rate of 13.5%. Pretreatment tumor size ≥ 2.4 cm [Exp(B) = 3.608, 95%CI: 1.512-8.609, P = 0.044] and radiologic vascular invasion [Exp(B) = 5.553, 95%CI: 2.269-14.589, P = 0.002] were independent predictive factors for neoadjuvant treatment. Borderline resectability [Exp(B) = 0.222, P = 0.008], pancreatic head cancer involving the pancreatic neck [Exp(B) = 9.461, P = 0.001] and arterial invasion [Exp(B) = 6.208, P = 0.010], and adjusted CA19-9 ≥ 50 [Exp(B) = 1.972 P = 0.019] were identified as prognostic clinical factors to predict tumor ***: The suggested preoperative defining system can help with designing treatment plans and also predict oncologic outcomes.

关键词： Preoperative defining system Pancreas head cancer Borderline resectable Adjusted CA19-9 Neoadjuvant therapy

A Low Noise L-band Dispersion-Compensating Hybrid Fiber Amplifier with 1500 nm Raman Pumping

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光学学报 2003年第S1期23卷 411-412页

作者： Hee Sang Chung Wonkyoung lee moo-jung Chu Department of Optical Communications Electronics and Telecommunications Research Institute 161 Gajeong-Dong Yuseong-Gu Daejeon 305-350 Republic of KoreaDepartment of Optical Communications Electronics and Telecommunications Research Institute 161 Gajeong-Dong Yuseong-Gu Daejeon 305-350 Republic of KoreaDepartment of Optical Communications Electronics and Telecommunications Research Institute 161 Gajeong-Dong Yuseong-Gu Daejeon 305-350 Republic of Korea

This report presents a low noise L-band dispersion-compensating hybrid fiber amplifier with 1500-nm Raman pumping. It describes the pre-stage optimization, Raman pump selection, and possible nonlinearity problems to a... 详细信息

关键词： nm in be of length A Low Noise L-band Dispersion-Compensating Hybrid Fiber Amplifier with 1500 nm Raman Pumping dBm EDF with NF

A356/SiC_P与列车实用中的有机闸片的滑动摩擦磨损特性

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稀有金属材料与工程 2008年第11期37卷 1956-1960页

作者：金云学 jung-moo lee Suk-Bong Kang 江苏科技大学先进焊接技术省级重点实验室江苏镇江212003 Advanced Materials Division Korea Institute of Machinery and Materials

以铝基复合材料作为列车制动盘材料的实用化为目的，选用A356／SIC 20％（体积分数，下同）复合材料和AISI D2工具钢为摩擦材料，以中速列车实用中的有机闸片为对偶材料，进行对比干摩擦磨损试验，并分析比较了磨损特性。结果表明：铝... 详细信息

以铝基复合材料作为列车制动盘材料的实用化为目的，选用A356／SIC 20％（体积分数，下同）复合材料和AISI D2工具钢为摩擦材料，以中速列车实用中的有机闸片为对偶材料，进行对比干摩擦磨损试验，并分析比较了磨损特性。结果表明：铝基复合材料在小于200Y（3．98MPa）的低载荷下，只存在轻微的氧化磨损，耐磨性比实用中的铁合金材料更好；而超过该载荷时。开始发生磨削磨损，磨损量逐步超过铁合金材料，当载荷达到400N（7．96MPa）时，由于严重的磨削磨损，磨损量剧增。而铁合金材料则随载荷和滑动速度增加，磨损率缓慢增加；磨损过程中的复合材料的摩擦系数平均值与载荷、滑动速度无关，始终保持0．3～0．4，同时随磨损距离的波动也非常小，而工具钢的摩擦系数平均值则对试验参数的敏感度相对大些，且摩擦系数平均值也比复合材料略小，即摩擦系数方面复合材料具有更好的特性。

关键词：列车制动盘铝基复合材料摩擦磨损

T6态A356/SiC与Semi-Metallic Pad的干滑动摩擦磨损特性

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稀有金属材料与工程 2008年第12期37卷 2147-2151页

作者：金云学 jung-moo lee Suk-Bong Kang 江苏科技大学先进焊接技术省级重点实验室江苏镇江212003 Korea Institute of Machinery and Materials Changwon 641-010Korea

选用A356/SiC复合材料与Semi-metallic pad材料进行干滑动摩擦磨损试验,并采用SEM、XRD、EDS等手段分析了复合材料的摩擦磨损特点及磨损机制。铝基复合材料与该pad间表现出非常出色的耐摩擦磨损特性,在1m/s的低滑动速度下,即使载荷增加... 详细信息

选用A356/SiC复合材料与Semi-metallic pad材料进行干滑动摩擦磨损试验,并采用SEM、XRD、EDS等手段分析了复合材料的摩擦磨损特点及磨损机制。铝基复合材料与该pad间表现出非常出色的耐摩擦磨损特性,在1m/s的低滑动速度下,即使载荷增加到700N也几乎不发生磨损;载荷不大于500N时,磨损率与滑动速度无关,保持非常小的范围。只有在高载荷、高滑动速度下才会有较为明显的磨损。摩擦系数则随载荷增大产生无规则变化,而随滑动速度的增加而减少,但变化幅度在0.1之内。复合材料耐磨特性好的主要原因是,磨损过程中磨损面上迅速形成以氧化物和石墨为主的润滑膜,减少磨损。高载荷、高滑动速度下磨损的主要特点为,复合材料表层形成塑性流动层,大的塑性流动变形使得较软的铝合金基体沿磨损方向以片状形式挤出,形成特殊的磨屑。而不易变形的SiC颗粒则留在磨损面上形成SiC聚集区,该区域又能在一定程度上减少进一步的磨损。

关键词： SiC 铝合金滑动磨损机制摩擦磨损