过烧YAG陶瓷晶界的分析

采用固相反应法用不同的烧结速率在1850℃烧结合成过烧钇铝石榴石（YAG）陶瓷，YAG陶瓷晶界形貌随烧结速率的变化而不同。高纯的毋Al2O3和Y2O3原料粉体经高能球磨在1400℃空气中煅烧，生成主相为YAG相的多相粉体化合物。真空烧结YAG陶瓷时烧结速率800℃／h并在1850℃真空烧结4h会使陶瓷中晶粒长大不充分，晶粒与晶粒之间仍保留明显的面接触，陶瓷内部残存大量直径约1μm的气孔，尺寸与可见光波长接近，对透过率的影响大，陶瓷成半透明；在以100~C／h升至1850℃真空烧结4h的YAG多晶陶瓷半透明化，陶瓷晶粒粗大，晶界宽化且保留熔融态凝固，用TEM及EDS确认晶界处存在毋α-Al2O3和钙钛型YAP共晶相。     

Effects of different tempers on precipitation hardening of 6000 series aluminium alloys

By means of Vickers hardness,mechanical property and formability tests,the effects of different tempers on precipitation hardening of 6000 series aluminium alloys for automotive body sheets were investigated.The results indicate that the short-time pre-aging at 170℃makes for subsequent artificial aging precipitation hardening.With the increase of pre-aging time,the artificial aging hardenability increases.The aging hardening rate reaches the maximum when pre-aging time is up to 10 min,and then it decreases.The short-time pre-aging at 170℃benefits sheets to obtain lower strength under delivery condition and consequently to improve stamping formability of automotive body sheets.The effects of different tempers on precipitation hardening are much more obvious than those of the alloying elements.It is a good treatment schedule to perform pre-aging for 5 min at 170℃right after solution treatment.     

Evolution of {001 } （110） orientation and related lattice rotation of A1 alloy 6111 during rolling

The texture evolution and lattice rotation in A1 alloy 6111 with an initial {001} （110）component during symmetrical and asymmetrical roiling were investigated by means of orientation distribution function（ODF）. The results show that the as-rolled initial {001 } （110） orientation evolves into not only the copper orientation but also all the other orientations along the β fiber, including the brass orientation, by lattice rotation around special directions. Compared with the symmetrical rolling, the {001 } （110）component in the surface layer on the slower roller side evolves more quickly into the orientations along the β fiber during asymmetrical rolling, while that in the surface layer on the faster roller side evolves more slowly.     

LJ—101型腐植酸系水质稳定剂在循环冷却水中的应用

开发出了新型腐植酸系水质稳定剂，对不锈钢，碳钢等材质效果尤好，是有一种很有推广价值的阻垢缓蚀剂。     

过滤式阴极电弧沉积类金刚石薄膜的性能分析

成功地研制了一套过滤式阴极电弧沉积设备,并利用该设备成功获得了类金刚石薄膜。类金刚石薄膜的扫描电镜分析表明：获得的薄膜在硅基片上是光滑和致密的,在Ｔｉ合金基片上有裂纹,高速钢基片上有微孔。原子力显微镜分析表明：膜层的表面粗糙度与沉积参数密切相关。喇曼光谱研究表明,这种薄膜是典型的无氢类金刚石薄膜,喇曼光谱的高斯分解表明：随着偏压的变化,Ｄ线和Ｇ线的位置μＤ、μＧ向低频移动,半高宽σＤ减小。     

多层金属纤维滤毡透气性能研究

研究了孔隙度与辅助层丝径对多层金属纤维滤毡透气性能的影响以及滤毡透气系数与孔隙度,孔径的关系,得出了三者之间关系的方程。研究表明,带有粗丝径辅助层的多层滤毡比同类型单层的透气性能好得多,且透气系数随辅助层丝径的增大而提高。所得到的经验方程可用来估算多层金属纤维滤毡的透气系数。     

冷芯盒砂芯对铸件质量的影响

应用阶梯试样法进行浇注试验,研究了在国产制芯原材料基础上的粘结剂用量及组分配比、原砂含泥量和水分、原砂粒度、附加物、砂芯存放时间和环境相对湿度、涂料、浇注温度等制芯和浇注工艺因素对铸件质量的影响,提出了减少铸件脉纹和粘砂缺陷,提高铸件表面精度的工艺方向。     

基于虚拟样机技术的人机工程学应用

随着计算机技术的发展,基于虚拟样机技术的人机工程学设计、测试评价已经成为可能.探讨利用人机工程分析软件提供的数字化人体模型,结合虚拟样机技术,在虚拟环境中模拟人的操作而进行的人机工程设计评价,提出了人机系统设计评价系统的基本框架.     

基于CAN总线的温室自动控制系统的通信设计

根据温室自动控制系统的特点，采用CAN总线与RS-485总线相结合的通信方案，详细介绍了该方案的软硬件设计。利用CAN总线高可靠性、应用灵活的特点，结合温室自动控制系统的通信需求，自定制通信协议实现了高效可靠的数据通信和良好的可扩展性。