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Polycrystalline diamond compact with enhanced thermal stability

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Journal of Materials Science & Technology 2017年第11期33卷 1386-1391页

作者： Shiqi Liu Lei Han Yongtao Zou pinwen zhu Baochang Liu College of Construction Engineering fllin University Changchun 130061 China Key Lab of Drilling and Exploitation Technology in Complex Conditions Ministry of Land and Resources Changchun 130061 China Xi'an Research Institute of China Coal Technology &Engineering Group Corp. Xi'an 710077 China State Key Laboratory ofSuperhard Materials Jilin University Changchun 130021 China

Polycrystalline diamond compacts（PDC）, which are composed of diamond and WC/Co substrate, and synthesized at high pressure and high temperature（HPHT）, are widely applied as the tooth of drilling bit. However, the thermal stability of PDC will be reduced when diamond transforms into graphite due to cobalt in PDC acting as a catalyst during the drilling work. In this study, a new three-layer structured PDC with enhanced thermal stability has been successfully synthesized at pressures of 5.5–7.0 GPa and temperatures of 1650–1750？C. In this structure, the diamond-Si C composite acts as the working layer,and the diamond-Si C-Co composite and WC/Co cements are as the intermediate layer and substrate,respectively. It is found that the initial oxidizing temperature of the three-layered PDC is enhanced up to820？C, which is significantly higher than that（～780？C） of the conventional PDC counterpart.

关键词： Polycrystallie diamond compacts High pressure and high temperature Thermal stability

{112}<111>Twins or Twinned Variants Induced by Martensitic Transformation?

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 133-140页

作者： Zuohua Wang Haidong Sun Peng Wang Ning Liu pinwen zhu Dongli Yu Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Liren College of Yanshan University Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

Twinned substructure in lath martensite was induced in the interstitial free(IF)steel via a high pressure thermal cycle(heating up to 1100℃and holding for 30 min,cooling at 10℃/s to room temperature under a pressure of 4 GPa).Experimental observations and theoretical simulation confrm that the twinned substructure has the origin related to the twinned variants rather than the bcc{112}twins,while extra difraction spots were caused by crystal overlapping rather than any extra *** diferences in crystallography and electron difraction behavior between twinned variants and{112}twins were discussed in detail.

关键词： Twinned variants {112}twins Martensitic transformation Crystal overlapping Electron difraction

Function of large-volume high-pressure apparatus at SECUF

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Chinese Physics B 2018年第7期27卷 81-85页

作者： pinwen zhu Qiang Tao Lu Wang Zhi He Tian Cui State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

Pressure allows the precise tuning of a fundamental parameter, the interatomic distance, which controls the electronic structure and virtually all interatomic interactions that determine material properties. Hence, pressure tuning is an effective tool in the search for new materials with enhanced properties. To realize pressure tuning on matter, large-volume press （LVP） apparatuses have been widely used not only to synthesize novel materials but also to implement the in situ measurement of physical properties. Herein, we introduce the LVP apparatuses, including belt-type, cubic anvil, and 6-8 type multi-anvil, that will be constructed at the Synergetic Extreme Condition User Facility （SECUF） at Jilin University. Typically, cell volumes of 1000 mm3 can be obtained at 20 GPa in a belt-type apparatus that is significantly larger than that obtained in a 6-8 type multi-anvil apparatus at the same pressure. Furthermore, the in situ measurement of physical prop- erties, including thermological, electrical, and mechanical behaviors, is coupled to these LVP apparatuses. Some typical results of both synthetic experiments and in situ measurements obtained from the LVP apparatuses are also reviewed.

关键词： high pressure large-volume press multi-anvil apparatus in situ measurement synthesis

Twinned Martensitic Substructure in a Water Quenched Fe–1.0 wt%C Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1157-1163页

作者： Haidong Sun Zuohua Wang Shuai Zhang Ning Liu pinwen zhu Dongli Yu Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Liren College of Yanshan University Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

A Fe–1.0 wt%C alloy was quenched into water from 1100 ℃,leading to lath martensite and plate martensite of body-centered tetragonal *** these two martensites have the twinned substructure that generates mirror symmetric diff raction patterns with extra diff raction spots around n/3(112).The twinned substructure has the origin from twinned martensitic variants,namely twin-related crystals separated by{110},rather than{112}deformation *** eff ect on the electron double diff raction of twinned variants was discussed.

关键词： Twinned martensitic substructure Twinned variant Lath martensite Plate martensite

High-pressure synthesis, mechanical properties, and oxidation behavior of advanced boron-containing α/β-Si3N4/Si ceramics using polymer-derived amorphous SiBN ceramics

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JOURNAL OF ADVANCED CERAMICS 2024年第10期13卷 1611-1621页

作者： Li, Wei Ma, Shuailing Cui, Siwen Ding, Jingxue Widenmeyer, Marc Zhang, Xiaoqi Zhan, Ying Yu, Zhaoju Zhang, Wenshu zhu, pinwen Cui, Tian Weidenkaff, Anke Riedel, Ralf Ningbo Univ Inst High Pressure Phys Sch Phys Sci & Technol Ningbo 315211 Peoples R China Tech Univ Darmstadt Dept Mat & Earth Sci D-64287 Darmstadt Germany Jilin Univ Coll Phys Synerget Extreme Condit High Pressure Sci Ctr State Key Lab Superhard Mat Changchun 130012 Peoples R China Fraunhofer Res Inst Mat Recycling & Resource Strat D-63755 Alzenau Germany Xiamen Univ Coll Mat Key Lab High Performance Ceram Fibers Minist Educ Xiamen 361005 Peoples R China

The preparation of dense Si3N4-based ceramics has attracted great attention because of the achievable improvements in their mechanical properties and high-temperature oxidation resistance. In this work, advanced dense boron-containing alpha/beta-Si3N4/Si monoliths were prepared via a high pressure-high temperature technique in which polymerderived amorphous SiBN powders were used as raw materials. The crystallization behavior and phase transformation of the polymer-derived amorphous samples were studied in the temperature range from 1400 to 1800 degrees C. The results demonstrate that the incorporation of boron in the Si3N4 matrix suppresses the phase transformation from alpha-Si3N4 to beta-Si3N4. Furthermore, the mechanical properties of the as-prepared samples were measured, and the maximum hardness and fracture toughness of boron-rich SiBN samples reached 14.8 GPa and 7.96 MPam1/2, respectively. The hardness of the obtained boron-rich SiBN samples is stable up to 300 degrees C. In addition, the oxidation behavior of the samples prepared at 1400 and 1600 degrees C was investigated at 1400 degrees C for 50 h. The results show that the incorporation of boron significantly improved the oxidation resistance of the samples because of the formation of borosilicate/cristobalite. This work provides guidance for the synthesis of boron-containing alpha/beta-Si3N4-based ceramics with excellent mechanical properties and oxidation

关键词： high-pressure synthesis Si 3 N 4 mechanical properties oxidation resistance

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煤炭行业循环经济发展模式及应用研究

生态经济 2015年第1期31卷 119-121,141页

作者：朱品文平顶山学院河南平顶山467000 四川大学四川成都610207

煤炭行业是我国主要的能源生产产业,在可持续发展理念深入人心的大环境下,发展循环经济已经成为贯彻落实科学发展观、实现行业可持续发展的必然选择。文章以煤炭行业循环经济发展模式为研究对象,结合目前国内煤炭行业发展中存在的问题,... 详细信息

煤炭行业是我国主要的能源生产产业,在可持续发展理念深入人心的大环境下,发展循环经济已经成为贯彻落实科学发展观、实现行业可持续发展的必然选择。文章以煤炭行业循环经济发展模式为研究对象,结合目前国内煤炭行业发展中存在的问题,从经济发展和价值创新的角度对煤炭行业可持续发展进行了深入探讨,并就其中的一些问题提出了自己的看法。

关键词：煤炭行业循环经济发展模式应用研究

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河南省循环农业发展的实践模式及借鉴

中国农业资源与区划 2016年第7期37卷 135-139页

作者：朱品文四川大学经济学院平顶山学院

发展循环农业是提高农产品竞争能力与转变农业发展方式的重要途径。文章就河南省循环农业的发展模式及情况进行分析,结果表明:目前河南省循环农业发展模式有3种,即再资源化模式、减量型模式、再使用型模式。同时,通过分析模式下的经济... 详细信息

发展循环农业是提高农产品竞争能力与转变农业发展方式的重要途径。文章就河南省循环农业的发展模式及情况进行分析,结果表明:目前河南省循环农业发展模式有3种,即再资源化模式、减量型模式、再使用型模式。同时,通过分析模式下的经济环境特性,探讨了河南省循环农业带来的启示,如政策支持循环农业发展、农民素质适应现代循环农业发展、规模经济有效促进循环农业发展、科技创新逐步适应循环农业的发展要求等。并提出了落实政府主导作用,加强宏观调控;加强循环农业示范点建设,发挥辐射带动作用;完善循环农业发展的帮扶政策;加强科技创新,为循环农业发展提供科学保障;努力构建循环农业发展环境与增长机制;加强舆论宣传,营造循环农业良好氛围等对策措施,以期为全国其他省份地区发展循环农业提供参考。

关键词：河南省农业循环经济实践模式模式

A distinctive HPHT platform with different types of large-volume press subsystems at SECUF

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Matter and Radiation at Extremes 2024年第6期9卷 4-18页

作者： Yufei Ge Shuailing Ma Cun You Kuo Hu Chuang Liu Yixuan Wang Xinglin Wang Xinyang Li Hongyu Li Qiang Tao Shuqing Jiang Lu Wang Hu Tang Di Yao Zhi He Xinyi Yang Zhaodong Liu Qiang Zhou pinwen zhu Bo Zou Bingbing Liu Tian Cui Synergetic Extreme Condition High-Pressure Science Center State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun 130012China Institute of High-Pressure Physics School of Physical Scientific and TechnologyNingbo UniversityNingbo 315211China

Large-volume presses(LVPs)providing large volumes,liquid media,deformation capability,jump compression,and in situ measurements are in great demand for high-pressure research,particularly in the fields of geoscience,condensed matter physics,material science,chemistry,and biology.A high-pressure and high-temperature(HPHT)platform with different LVP subsystems,both solid-state and liquid environments,and nonequilibrium subsystems,has been constructed at the Synergetic Extreme Condition User Facility,Jilin *** article describes the construction of the different subsystems and provides an overview of the capabilities and characteristics of the different HPHT subsystems.A large sample volume(1000 mm^(3))at 20 GPa is achieved through the use of a belt-type apparatus in the solid-state *** conditions(1.8 GPa and 1000 K)are realized in the liquid subsystem through the use of a piston-cylinder-type LVP with optical diamond windows for in situ spectroscopic measurements.A maximum pressure jump to 10.2 GPa can be reached within 20 ms in the nonequilibrium subsystem with the use of an improved bladder-pressurization jump *** typical results obtained with different LVPs are briefly reviewed to illustrate the applications and advantages of these *** summary,the platform described here has the potential to contribute greatly to high-pressure research and to innovations in high-pressure technology.

关键词： deformation nonequilibrium apparatus

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B4C-TiB2复相陶瓷材料研究进展

陶瓷学报 2020年第6期41卷 783-795页

作者：王晓楠陶强左斌朱品文吉林大学物理学院超硬材料国家重点实验室吉林长春130012 吉林师范大学功能材料物理与化学教育部重点实验室吉林长春130103

B4C-TiB2复相陶瓷材料既具有B4C的高硬度和低密度,又具有TiB2的高韧性和导电性,是一种极具应用前景的复相陶瓷材料,并受到广泛关注。在此类材料中同时获得高韧性和高硬度一直是材料领域的迫切需求,同时也是巨大挑战。针对近年来日益丰富... 详细信息

B4C-TiB2复相陶瓷材料既具有B4C的高硬度和低密度,又具有TiB2的高韧性和导电性,是一种极具应用前景的复相陶瓷材料,并受到广泛关注。在此类材料中同时获得高韧性和高硬度一直是材料领域的迫切需求,同时也是巨大挑战。针对近年来日益丰富的B4C-TiB2复相陶瓷材料研究,围绕B4C-TiB2复相材料致密性及增韧相含量,晶粒尺寸,第三相组元等增强增韧三个关键因素,对目前B4C-TiB2复相陶瓷材料的研究进展作了阐述。认为高致密性和适当的增韧相含量(≤15%)是获得均衡的硬度和韧性的必要条件;晶粒细化能促使B4C与TiB2间晶界的强化以及沿晶断裂模式增多,继而提升材料的硬度和韧性;第三相组元的引入有助于材料致密度的提升和微观结构的优化,从而改善B4C-TiB2复相陶瓷材料的硬度和韧性。

关键词： B4C-TiB2 复相陶瓷烧结工艺力学性能