光伏多晶铸锭生产过程氩气循环利用技术研究

多晶硅铸锭在生产中采用的氩气排空方式存在生产成本高、电力消耗大、环境污染严重的问题。基于此本文提出多晶铸锭生产中氩气循环利用技术,通过采用一套真空泵联机多台多晶硅铸锭炉的技术,研发了一套纯化单元及控制系统,实现了氩气的循环再利用。多次采集的气体实验结果表明,本文所提出的技术研究降低了生产成本,减少了氩气的浪费,在一定程度上降低了因氩气的排放对大气造成的污染,进一步实现了光伏环境友好型的绿色发展。     

碳化硅陶瓷的放电等离子烧结

采用添加了Al₂O₃和Y₂O₃助烧剂的碳化硅微粉为原料,通过放电等离子烧结(SPS)技术快速制备了碳化硅陶瓷.分析了材料致密化过程,并重点研究了烧结工艺参数对材料致密度和力学性能的影响规律.结果表明,当SPS工艺参数的烧结温度和压力分别为1600℃和50MPa时,经过5min的烧结,碳化硅陶瓷的致密度可达到99.1%,硬度为HV2550,断裂韧性达8.34MPa·m^1/2,弯曲强度达684MPa.     

Mn含量对铸造高铌TiAl合金组织和性能的影响

选择两种Mn含量不同的高铌TiAl合金Ti46Al8Nb2Mn0.2B和Ti46Al8Nb1.3Mn0.2B,通过热等静压(HIP)及后续热处理,结合组织和力学性能的分析,研究了Mn含量对高铌TiAl合金的组织和性能的影响.XRD和SEM背散射电子实验结果表明:Mn含量较高的Ti46Al8Nb2Mn0.2B合金,经热等静压及循环热处理,得到的双态组织较粗大,并且有少量脆性β相存在;Mn含量较低的Ti46Al8Nb1.3Mn0.2B合金,经热等静压后直接在双相区长时间保温处理,得到了细小的双态组织,并且完全消除了β相.室温拉伸实验表明,Mn含量的降低提高了Ti46Al8Nb1.3Mn0.2B合金的力学性能,其延伸率、屈服强度和断裂强度分别达到2.4%、548MPa和660MPa.断口形貌分析表明,室温下两种合金都属于解理断裂.     

实验型调速搅拌磨设计

湿法搅拌研磨机可以满足精细陶瓷粉料的超细加工需求,结构设计合理的搅拌磨可以通过小于12h的研磨,获得粒度分布窄、中位径D50〈0．6μm的碳化硅陶瓷粉体．搅拌桶可替换,容积可变,主轴转速调速范围为0～2000r／min,满足碳化硅等超硬材料粉碎需要的实验室小型搅拌磨的设计．可变容积实验室搅拌磨总体结构、变速方案、电路设计以及冷却水循环系统的设计方案已被采用,所制造的搅拌磨已应用于科研和产品开发中．     

硅碳管的特性及使用方法

介绍了硅碳管的特性,并根据作者单位化验室的使用经验,介绍了硅碳管在使用过程中的一些应注意事项。     

Perspective: optically-pumped III–V quantum dot microcavity lasers via CMOS compatible patterned Si (001) substrates

Direct epitaxial growth III–V quantum dot (QD) structures on CMOS-compatible silicon substrates is considered as one of the most promising approaches to achieve low-cost and high-yield Si-based lasers for silicon photonic integration. However, epitaxial growth of III–V materials on Si encounters the following three major challenges: high density of threading dislocations, antiphase boundaries and thermal cracks, which significantly degrade the crystal quality and potential device performance. In this review, we will focus on some recent results related to InAs/GaAs quantum dot lasers on Si (001) substrates by III–V/IV hybrid epitaxial growth via (111)-faceted Si hollow structures. Moreover, by using the step-graded epitaxial growth process the emission wavelength of InAs QDs can be extended from O-band to C/L-band. High-performance InAs/GaAs QD micro-disk lasers with sub-milliwatts threshold on Si (001) substrates are fabricated and characterized. The above results pave a promising path towards the on-chip lasers for optical interconnect applications.     

多热源合成SiC传热规律

对多热源合成SiC冶炼炉的温度场进行了数值模拟,研究了冶炼炉内的温度分布、热流强度以及温度梯度的动态变化规律,揭示了多热源合成SiC的传热传质规律.研究表明, 由于多热源之间的屏蔽作用与热能叠加作用,导致多热源合成SiC技术比Acheson单热源炉的单炉产量提高48.1%,特、一级品率提高30%,节能10%以上,并且杜绝了单热源生产中频繁喷炉事故,使生产更安全.     

Polyphenol-Enriched Composite Bone Regeneration Materials: A Systematic Review of In Vitro Studies

One of the possible alternatives for creating materials for the regeneration of bone tissue supporting comprehensive reconstruction is the incorporation of active substances whose controlled release will improve this process. This systematic review aimed to identify and synthesize in vitro studies that assess the suitability of polyphenolics as additives to polymer-ceramic composite bone regeneration materials. Data on experimental studies in terms of the difference in mechanical, wettability, cytocompatibility, antioxidant and anti-inflammatory properties of materials were synthesized. The obtained numerical data were compiled and analyzed in search of percentage changes of these parameters. The results of the systematic review were based on data from forty-six studies presented in nineteen articles. The addition of polyphenolic compounds to composite materials for bone regeneration improved the cytocompatibility and increased the activity of early markers of osteoblast differentiation, indicating a high osteoinductive potential of the materials. Polyphenolic compounds incorporated into the materials presumably give them high antioxidant properties and reduce the production of reactive oxygen species in macrophage cells, implying anti-inflammatory activity. The evidence was limited by the number of missing data and the heterogeneity of the data.