In this study,tetraploid of oil camellia (Camellia oleifera) was identified from the superior clones which were treated with colchicine,and the tetraploid variation was investigated with the experimental material. Ana...
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In this study,tetraploid of oil camellia (Camellia oleifera) was identified from the superior clones which were treated with colchicine,and the tetraploid variation was investigated with the experimental material. Analysis of the number of chromosome showed the chromosome number of the tetraploid oil camellia was 2n=4x=60,compared with the diploid (2n=2x=30). The morphological observation showed that the leaf area,leaf length,leaf width,leaf thickness and the space of leaf in the tetraploid were respectively increased by 9.8%,38.5%,25%,48.25%,67%,compared with the diploid. The chlorophyll content and the length and width of guard cells were respectively increased by 47.87%,48.15% and 37.26%,while the leaf-shape index reduced 38.1% than that in the control group. In addition,the leaf of tetraploid plant became more round,the total DNA content was twice as the control group was,and the net photosynthetic rate was also greater than that of the control group. The genetic polymorphism analysis with the mtDNA and cpDNA primers showed that no polymorphic locus was found in the tetraploid,which meant that the tetraploid was autotetraploid,however the genetic polymorphism analysis in the nDNA exhibited that the polymorphic ratio was 51%.
为了提高Inconel 718合金在高温高压和强氧化等恶劣工况下的服役性能，采用激光熔覆在其表面上制备了掺杂不同SiC质量分数的Ni60-SiC复合涂层：Ni60-10% SiC （C1）、Ni60-20% SiC （C2）和Ni60-30% SiC （C3）。利用X射线衍射仪 （XRD...
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为了提高Inconel 718合金在高温高压和强氧化等恶劣工况下的服役性能，采用激光熔覆在其表面上制备了掺杂不同SiC质量分数的Ni60-SiC复合涂层：Ni60-10% SiC （C1）、Ni60-20% SiC （C2）和Ni60-30% SiC （C3）。利用X射线衍射仪 （XRD）、扫描电子显微镜 （SEM）和能量色散仪 （EDS）等表征方法和高温摩擦磨损试验等性能测试方法，对涂层的物相、显微组织、显微硬度和摩擦学性能进行了系统分析，并深入探讨了其在室温及600 ℃下的磨损机理和800 ℃下的抗氧化性能。结果表明：Ni60-SiC复合涂层的主要物相为（Fe， Ni）、CrNix、Ni3Si和Cr23C6；由于固溶强化、细晶强化以及弥散分布在涂层内部的硬质相，涂层的显微硬度为基材的2.6～3.1倍；室温和600 ℃下，C2涂层的减摩性和耐磨性均表现最佳，平均摩擦系数分别提高了20.44%和46.62%，磨损率分别降低了75.12%和63.70%；随着SiC含量的增加，犁削效应减弱和脆性脱黏出现导致平均摩擦系数先降低后上升；此外，所有涂层的抗氧化性能均优于基材，其中C3涂层表现出最优异的抗氧化性能。
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