Goal: Low wolfram-containing cutting composite was obtained by fusion of titanium carbonitride and high melting temperature binding metallic phase. Method: The composite was obtained via compaction and further sinteri...Goal: Low wolfram-containing cutting composite was obtained by fusion of titanium carbonitride and high melting temperature binding metallic phase. Method: The composite was obtained via compaction and further sintering in vacuum furnace at 1600°C under 10<sup>-3</sup> Pa pressure. Phase analysis was performed on X-ray apparatus “DRON-3”;microstructure was determined by electron microscope NANOLAB-7, microhardness by MUCKE-mark microhardness meter;relative resistance of cutters was evaluated at similar modes of cutting according to distances they passed;experiments were carried out on turning lathe. Results: Physical-mechanical characteristics of the obtained composite are: σ<sub>bend</sub>, = 1000 - 1150 MPa, σ<sub>bend1000</sub>°C = 600 MPa, HV = 14 GPa;HV<sub>1000</sub>°C = 6.5 GPa. High speeds of cutting and high temperatures resistance of cutters made by the obtained composites exceeds 1.5 - 2-folds that of cutters made of the known BK8 and KNT20 hard alloys. Conclusion: Its application is recommended in hot steel treatment by cutting, for removal of the so-called burrs, as well as in steel treatment by cutting during pure and semi-pure operations. It can also be used in jet engines, chemical industry apparatuses, electric-vacuum devices, in industry of responsible details of rockets, nuclear reactors, flying apparatuses.展开更多
文章采用微波消解-电感耦合等离子体质谱（inductively coupled plasma mass spectrometry,ICP/MS）法测定卷烟烟丝及接装纸、卷烟纸、滤棒丝束等卷烟辅材中铬、锰、钴、镍、铜、锌、砷、硒、锶、镉、锡、锑、钡、汞、铅15种重金属元素...文章采用微波消解-电感耦合等离子体质谱（inductively coupled plasma mass spectrometry,ICP/MS）法测定卷烟烟丝及接装纸、卷烟纸、滤棒丝束等卷烟辅材中铬、锰、钴、镍、铜、锌、砷、硒、锶、镉、锡、锑、钡、汞、铅15种重金属元素。采用硝酸/双氧水酸体系微波消解卷烟烟丝、接装纸、卷烟纸及滤棒丝束样品,定容后进行ICP/MS分析。各元素的加标回收率为84.8%-118.6%,检出限为10.9-246.3ng/L。样品的检测结果表明：卷烟的烟丝及辅材中均检出了多种重金属元素,其中接装纸和卷烟纸中各检出11种重金属,其次是烟丝中检出9种,滤棒丝束中检出4种;同一卷烟样品的烟丝及各辅材中,滤棒丝束中检出重金属的种类最少,质量比也最低;卷烟烟丝及辅材中一部分重金属的含量随着卷烟档次的升高呈现一定的增加或减少的趋势;国外卷烟与国产卷烟同类辅材中检出的重金属种类类似。展开更多
金刚石涂层工具一直是金刚石膜工具应用研究的主流。制约其产业化的主要因素是涂层的附着力低和微晶金刚石涂层工具的加工精度差。通过对衬底的有效预处理和CVD沉积过程控制的研究,开发在硬质合金基体上沉积高结合强度、低粗糙度的金刚...金刚石涂层工具一直是金刚石膜工具应用研究的主流。制约其产业化的主要因素是涂层的附着力低和微晶金刚石涂层工具的加工精度差。通过对衬底的有效预处理和CVD沉积过程控制的研究,开发在硬质合金基体上沉积高结合强度、低粗糙度的金刚石涂层新技术,对于实现CVD金刚石涂层刀具高效、高精度切削加工具有重要意义。对旨在提高金刚石涂层附着力的预处理技术,本文探索了将酸蚀脱钴+等离子体刻蚀处理衬底法。利用优化的沉积工艺,在酸浸+等离子刻蚀处理的YG6刀片上沉积的两层金刚石复合膜表面粗糙度为0.13μm,附着力压痕测试临界载荷大于1500N。金刚石涂层工具的切削加工性能明显高于无涂层硬质合金工具。在加工ZA lS i12合金时,单层和两层金刚石涂层车刀片的切削寿命分别是无涂层车刀片切削寿命的21倍和28倍。展开更多
The ＂poly＂ chair is a combination of the excellent elements of traditional arts and crafts and modern materials. Some innovations have been made while respecting the lines and patterns of the traditional chair in th...The ＂poly＂ chair is a combination of the excellent elements of traditional arts and crafts and modern materials. Some innovations have been made while respecting the lines and patterns of the traditional chair in the design of the ＂poly＂ chair. The structure of the chair adopts the traditional pattern fish scale pattern, engraving it on the seat surface, which not only looks beautiful but also plays a supporting role; its transparent feeling gives a visual feast. In each of its structures, some of our traditional elements are properly applied to the chairs. Break the wooden structure of the past, the use of stainless steel material, the perfect combination of traditional and modern elements. So that ＂poly＂ chair is not only an ornamental handicrafts, but also a use of furniture, functional and decorative unity. In giving the feeling of light and transparent at the same time, gives a sense of grace. This design report details the selection of topics from research, to the design of the entire process.展开更多
文摘Goal: Low wolfram-containing cutting composite was obtained by fusion of titanium carbonitride and high melting temperature binding metallic phase. Method: The composite was obtained via compaction and further sintering in vacuum furnace at 1600°C under 10<sup>-3</sup> Pa pressure. Phase analysis was performed on X-ray apparatus “DRON-3”;microstructure was determined by electron microscope NANOLAB-7, microhardness by MUCKE-mark microhardness meter;relative resistance of cutters was evaluated at similar modes of cutting according to distances they passed;experiments were carried out on turning lathe. Results: Physical-mechanical characteristics of the obtained composite are: σ<sub>bend</sub>, = 1000 - 1150 MPa, σ<sub>bend1000</sub>°C = 600 MPa, HV = 14 GPa;HV<sub>1000</sub>°C = 6.5 GPa. High speeds of cutting and high temperatures resistance of cutters made by the obtained composites exceeds 1.5 - 2-folds that of cutters made of the known BK8 and KNT20 hard alloys. Conclusion: Its application is recommended in hot steel treatment by cutting, for removal of the so-called burrs, as well as in steel treatment by cutting during pure and semi-pure operations. It can also be used in jet engines, chemical industry apparatuses, electric-vacuum devices, in industry of responsible details of rockets, nuclear reactors, flying apparatuses.
文摘文章采用微波消解-电感耦合等离子体质谱（inductively coupled plasma mass spectrometry,ICP/MS）法测定卷烟烟丝及接装纸、卷烟纸、滤棒丝束等卷烟辅材中铬、锰、钴、镍、铜、锌、砷、硒、锶、镉、锡、锑、钡、汞、铅15种重金属元素。采用硝酸/双氧水酸体系微波消解卷烟烟丝、接装纸、卷烟纸及滤棒丝束样品,定容后进行ICP/MS分析。各元素的加标回收率为84.8%-118.6%,检出限为10.9-246.3ng/L。样品的检测结果表明：卷烟的烟丝及辅材中均检出了多种重金属元素,其中接装纸和卷烟纸中各检出11种重金属,其次是烟丝中检出9种,滤棒丝束中检出4种;同一卷烟样品的烟丝及各辅材中,滤棒丝束中检出重金属的种类最少,质量比也最低;卷烟烟丝及辅材中一部分重金属的含量随着卷烟档次的升高呈现一定的增加或减少的趋势;国外卷烟与国产卷烟同类辅材中检出的重金属种类类似。
文摘金刚石涂层工具一直是金刚石膜工具应用研究的主流。制约其产业化的主要因素是涂层的附着力低和微晶金刚石涂层工具的加工精度差。通过对衬底的有效预处理和CVD沉积过程控制的研究,开发在硬质合金基体上沉积高结合强度、低粗糙度的金刚石涂层新技术,对于实现CVD金刚石涂层刀具高效、高精度切削加工具有重要意义。对旨在提高金刚石涂层附着力的预处理技术,本文探索了将酸蚀脱钴+等离子体刻蚀处理衬底法。利用优化的沉积工艺,在酸浸+等离子刻蚀处理的YG6刀片上沉积的两层金刚石复合膜表面粗糙度为0.13μm,附着力压痕测试临界载荷大于1500N。金刚石涂层工具的切削加工性能明显高于无涂层硬质合金工具。在加工ZA lS i12合金时,单层和两层金刚石涂层车刀片的切削寿命分别是无涂层车刀片切削寿命的21倍和28倍。
文摘The ＂poly＂ chair is a combination of the excellent elements of traditional arts and crafts and modern materials. Some innovations have been made while respecting the lines and patterns of the traditional chair in the design of the ＂poly＂ chair. The structure of the chair adopts the traditional pattern fish scale pattern, engraving it on the seat surface, which not only looks beautiful but also plays a supporting role; its transparent feeling gives a visual feast. In each of its structures, some of our traditional elements are properly applied to the chairs. Break the wooden structure of the past, the use of stainless steel material, the perfect combination of traditional and modern elements. So that ＂poly＂ chair is not only an ornamental handicrafts, but also a use of furniture, functional and decorative unity. In giving the feeling of light and transparent at the same time, gives a sense of grace. This design report details the selection of topics from research, to the design of the entire process.
