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Structural stability at elevated temperatures of the AlSi6Cu4 matrix composite with graphite particles
aluminium alloys pressure casting composites structure
2011/3/30
The results of investigation of structure stability of the AlSi6Cu4 matrix alloy and composites with graphite particles at elevated temperatures were presented. Composites and matrix alloy were prep...
Use of barbotage refining of aluminum-silicon alloy to improve mechanical properties of pressure castings
Al-Si alloy barbotage refining high pressure die castings mechanical properties
2011/3/30
This study presents the research results of the influence that barbotage refining on the mechanical properties of high pressure die casting made of AlSi12S alloy. The operation of refining was conduct...
Use of barbotage refining of aluminum-silicon alloy to improve mechanical properties of pressure castings
Al-Si alloy barbotage refining high pressure die castings mechanical properties
2011/3/30
This study presents the research results of the influence that barbotage refining on the mechanical properties of high pressure die casting made of AlSi12S alloy. The operation of refining was conduct...
Refining processes of selected copper alloys
docohesion elastic-plastic model strain nominal-stress HMH hypothesis
2011/3/30
The analysis of the refining effectiveness of the liquid copper and selected copper alloys by various micro additions and special refining substances – was performed. Examinations of an influence of p...
Refining processes of selected copper alloys
docohesion elastic-plastic model strain nominal-stress HMH hypothesis
2011/3/30
The analysis of the refining effectiveness of the liquid copper and selected copper alloys by various micro additions and special refining substances – was performed. Examinations of an influence of p...
Effect of additives promoting the formation of lustrous carbon on the knocking out properties of foundry sands with new inorganic binders
Innovative foundry materials and technologies inorganic binders lustrous carbon knocking out properties strength
2011/3/29
The article presents the results of investigations, which make a fragment of the broad-scale studies carried out as a part of the statutory activity on optimising the foundry sand technology using new...
Effect of additives promoting the formation of lustrous carbon on the knocking out properties of foundry sands with new inorganic binders
Innovative foundry materials and technologies inorganic binders lustrous carbon knocking out properties strength
2011/3/29
The article presents the results of investigations, which make a fragment of the broad-scale studies carried out as a part of the statutory activity on optimising the foundry sand technology using new...
金属磁记忆(MMM)检测方法
无损检测 金属磁记忆 铁磁性材料
2009/1/9
工程中常采用无损检测(Nondestructive Testing简写为NDT)的方法检测设备与构件的缺陷,但传统的NDT检测方法却无法对金属进行早期诊断。金属磁记忆(MMM)技术可以准确探测出被测对象上以应力集中区为特征的危险部件和部位,是迄今为止对金属部件进行早期诊断唯一行之有效的NDT方法。本文综述金属磁记忆方法的基本检测原理、主要诊断设备、目前国内外研究现状,以及该项技术的发展前景。
定向凝固冷速对Ti-O超细夹杂物析出的影响
单向凝固 钛氧超细夹杂物 冷却速率 耦合模
2008/12/9
钢中钛氧超细夹杂物对提高钢材性能具有重大意义。本工作采用单向凝固法模拟了凝固过程中二次枝晶臂间溶质富集时钛氧夹杂物的析出情况,从而考察出冷却速率对钛氧超细夹杂物尺寸、数量及分布的影响,进而验证出凝固过程微观偏析和钛氧夹杂生成耦合模型的准确性。单向凝固实验结果表明,冷却速率增高钛氧夹杂尺寸减小、数量增多、分布更为均匀。在10k/min(模铸)、100k/min(方坯)、200k/min(中厚板)冷却...
利用Confocal激光扫描显微镜原位观察了AISI304不锈钢熔化过程中夹杂物在固-液(S-L)糊状区内的漂移与聚集行为。结果显示,夹杂在剩余固相形成的液相通道中漂移,剩余奥氏体体积分数70%时平均漂移速率为80 μm/s;近完全熔化时,远离S-L界面的夹杂漂移速率高达1500 μm/s,而S-L界面附近的夹杂速率在50 ~ 200 μm/s之间。发现近完全熔化时钢熔体表层存在一层金属膜(δ铁素...
钢包内吹氩过程夹杂物的去除效果直接影响钢产品的质量。本文通过选择乳状液滴模拟夹杂物和偏心底吹钢包水模型实验,考察了喷嘴和透气砖吹气条件下时间、吹气量对夹杂物去除行为的影响规律。结果表明:较小气量和较大气量分别在8 min和16 min内可将绝大部分的模拟夹杂物去除,28 min内可将能够去除的模拟夹杂物几乎全部去除;喷嘴吹气时存在一个最佳去夹杂气量,而透气砖吹气时较小气量的去夹杂效果要好于较大气量...
一种检测GaN基材料局域光学厚度均匀性的方法
均匀性光学厚度 GaN基材料
2008/11/24
该方法是检测GaN基材料局域光学厚度均匀性的方法。采用显微荧光光谱测量,将测得数据进行处理获得振荡干涉谱,再对干涉谱进行干涉峰位线性拟合,进而得到材料的光学厚度,然后用常规的统计方法就可直接得到厚度不均匀性的分布特征。该方法可为材料生长工艺优化研究提供丰富的信息,特别对严重损害器件质量的局域非均匀性检测方面具有明显的意义。
先进的材料检测技术及设备
设备 材料检测技术
2008/11/24
本项目以高度集成的计算机自动控制及检测技术为基础,和生产实际相结合,实现了试验机、理化试验仪器的自动化检测及控制。包括以下八项检测与测量系统:
铁磁材料应力检测仪制造技术
铁磁材料 应力检测仪
2008/11/24
该校研制的铁磁材料应力检测仪是依据铁磁材料在磁化、受力状态下,释放的磁弹噪讯可在线检测铁磁材料、构件及产品的服役应力、疲劳、损伤、焊接构件的热残余应力,其精确度可达±1Mpa。该仪器采用单片机控制,数码显示测试数据,其水平达到世界先进,并于1999年3月通过了机械工业总公司(原机械工业部)主持的技术鉴定。本仪器携带方便,可现场实施,定点、瞬间检测,广泛用在桥梁、铁路、航天、航空、船舶、建筑、锅炉...
生物降解材料降解参数及其检测方法的研究
生物降解材料 降解参数 降解菌
2008/11/24
该项目在分析现有生物降解材料结构特点的基础上,对各类生物降解材料的降解菌进行分离;建立了生物降解材料降解菌库,包括各类生物降解材料降解菌 200余株;研究了降解菌生长、繁殖与材料降解、降解液特征变化之间的关系;建立了评价材料生物降解性能的混合菌液培养检测新方法;研制出生物降解材料降解参数测定用检测装置。该技术采用冷冻干燥的生物降解材料优先降解菌,在确立了成分的降解液和降解培养条件,利用所研制的...