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应用于刚挠印制板无铅工艺兼容的不流动性半固化片 被引量:3
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作者 倪乾峰 袁正希 +4 位作者 莫芸绮 何为 何波 陈浪 王淞 《印制电路信息》 2009年第1期32-34,共3页
当今电子产品的功能不断增加,随之而来的是对电子产品设计多样化的要求。正是由于这种需求,刚挠结合板以其巨大的技术进步和不断增加的需求而获得关注。这其中的不流动性半固化片是将刚性板与挠性板结合在一起的关键材料,它的主要功能... 当今电子产品的功能不断增加,随之而来的是对电子产品设计多样化的要求。正是由于这种需求,刚挠结合板以其巨大的技术进步和不断增加的需求而获得关注。这其中的不流动性半固化片是将刚性板与挠性板结合在一起的关键材料,它的主要功能是在刚性材料和挠性材料之间形成可靠性的粘接层,所以对该材料界面性质和功能进行研究。对于不流动性半固化片的应用来说是至关重要的。现在,一种新的基于酚醛固化树脂体系的不流动性半固化片已经被开发出来,这种新型材料显示了优异的耐热性和可靠性。经过热性能分析和热冲击测试,这种新型材料的性能比传统的DICY固化环氧树脂体系材料更加优越。 展开更多
关键词 刚挠结合板 不流动的半固化片 粘接层 酚醛固化树脂体系 dicy固化环氧树脂体系
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高效液相色谱法在覆铜板生产过程中的应用
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作者 李丹 孟运东 杨中强 《绝缘材料》 CAS 北大核心 2016年第5期70-73,共4页
在覆铜板的生产过程中,双氰胺(DICY)是常用的固化剂,它在配方中的含量直接影响树脂的交联固化程度,进而影响板材的各项性能。采用高效液相色谱法(HPLC)测定半固化片中的残留DICY含量,得出最佳的色谱条件为:C_(18)色谱柱(150 cm×4.6... 在覆铜板的生产过程中,双氰胺(DICY)是常用的固化剂,它在配方中的含量直接影响树脂的交联固化程度,进而影响板材的各项性能。采用高效液相色谱法(HPLC)测定半固化片中的残留DICY含量,得出最佳的色谱条件为:C_(18)色谱柱(150 cm×4.6 mm,5μm);以乙腈-水(体积比为40∶60)为流动相;检测波长为220 nm;流速为1.0 m L/min;柱温为25℃。在此色谱条件下,DICY的进样量在0.04~1.2μg范围内呈良好的线性关系,相关系数R^2=0.9997,DICY的平均回收率达到97.67%,可在5 min内完成测试。该方法可在生产过程中快速、准确的测定半固化片中的残留DICY含量。 展开更多
关键词 覆铜板 半固化片 固化剂 高效液相色谱 dicy
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Effect of Exhaust Gas Recirculation on Performance and Emission Characteristics of a Diesel-Piloted Biogas Engine 被引量:1
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作者 Meshack Hawi Robert Kiplimo Hiram Ndiritu 《Smart Grid and Renewable Energy》 2015年第4期49-58,共10页
In this research, a Direct Injection Compression Ignition (DICI) engine was modified into a dual-fuel engine that used biogas as the primary fuel and diesel as pilot fuel, with the focus on reduction of harmful exhaus... In this research, a Direct Injection Compression Ignition (DICI) engine was modified into a dual-fuel engine that used biogas as the primary fuel and diesel as pilot fuel, with the focus on reduction of harmful exhaust emissions while maintaining high thermal efficiency. The effect of exhaust gas recirculation (EGR) on engine performance and emission characteristics was studied. The EGR system was developed and tested with different EGR percentages, i.e. 0%, 10%, 20% and 30%. The effect of EGR on exhaust gas temperature and performance parameters like brake specific fuel consumption, brake power and brake thermal efficiency was studied. The performance and emission characteristics of the modified engine were compared with those of the conventional diesel engine. The results showed that EGR led to a decrease in specific fuel consumption and an increase in brake thermal efficiency. With increase in percent (%) of EGR, the percentage increase in brake thermal efficiency was up to 10.3% at quarter load and up to 14.5% at full load for single fuel operation while for dual-fuel operation an increase up to 9.5% at quarter load and up to 11.2% at full load was observed. The results also showed that EGR caused a decrease in exhaust gas temperature;hence it’s potential to reduce NOX emission. However, emissions of HC and CO increased slightly with EGR. 展开更多
关键词 DICI ENGINE Dual-Fuel ENGINE EGR NOX
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