医用生物活性材料的研究

本文以CaO-Al_2O_3-P_2O_5系统为基础玻璃;加入一定量的羟基磷灰石、磷酸氢钙,混合、成型后,经热处理而制得医用生物活性复合材料。用差热分析、X射线衍射分析、扫描电镜和电子探针X射线衍射分析鉴定了材料中的晶相和显微结构,并对该材料的气孔率、化学性质和弹性模量等性能进行了测试和分析。动物试验结果表明,此种材料具有良好的生物相容性和生物活性,是一种具有实用价值的新型人工骨材料。     

SiC WHISKER-TOUGHENED ALUMINIUM NITRIDE CERAMICS

Aluminium nitride ceramics containing 15-30 w/o of SiC whiskers can be sintered tofull density(by hot pressing at 1800℃)using2-3 w/o of Y_2O_3,additions.The whiskersincrease the toughness and strength of thecomposite,K_(10) increasing from 2.8 to about5.0 and flexural strength increasing by 30-50%.However,the whiskers must be welldispersed and if the dispersion is notsatisfactory,toughness may increase but thestrength decreases.The hot-pressingtemperature can be reduced by up to 100℃ ifY(NO_3)_3 .5H_20 is used as the sinteringadditive instead of Y_2O_3,but some oxidation ofthe AIN occurs during heating.Isopropan-2-01 is a better dispersing agent thancyclohexane,but again some oxidation of theAIN does occur.The best sample prepared during this work contained 20 w/o of SiC whiskers and 2 w/oY_2O_3 added as Y(NO_3)_3. 5H_2O and mixed inisopropanol.This exhibited a mean strength of453MPa(maximum 522MPa,measured bydisc flexure)and a fracture toughness of5.5MPam~(1/2).     

STUDY ON TECHNIQUE OF GRANULATION BY HF—PLASMA SPRAYING

The process of complex granules preparedby HF plasma spraying through axial feedingand thermodynamic analysis of the process isdescribed.The densification factors of complexgranules is also discussed,the result of whichcoincides with the test results.The process hasthe advantages of simple processing,convenientoperation,high purity and wide applications.Itis an effective way for producing complexgranules by multicomponent metallic powders andceramic metal powders.     

RESEARCH ON THE CERAMIC-PROBE OF ELECTRIC-CAPACITY LIQUIDOMETER

The processing of ceramic-probe made bysuperpure alumina for electric-capacityliquidometer is reported in present paper.Theprobe which has higher mechanical strength,more chemical stability and better electricinsulating properties can ensure that theelectric-capacity liquidometer works well underthe violent vibrational shock.The mechanical andchemical properties and the microstructure ofthe materials used for the probe are studied.     

STUDY ON TECHNIQUE OF GRANULATION BY HF—PLASMA SPRAYING

The process of complex granules preparedby HF plasma spraying through axial feedingand thermodynamic analysis of the process isdescribed.The densification factors of complexgranules is also discussed,the result of whichcoincides with the test results.The process hasthe advantages of simple processing,convenientoperation,high purity and wide applications.Itis an effective way for producing complexgranules by multicomponent metallic powders andceramic metal powders.     

电冶矾土刚玉质自流浇注料的研究

以电冶矾土刚玉为骨料有利于提高浇注料的自流性能 ;六偏磷酸钠分散剂对Al2 O3泥浆流变性能有较理想的改善作用 ;电冶矾土刚玉质自流浇注料具有优良的抗渣性能 ,这主要同浇注料的显微结构和电冶矾土刚玉骨料的性能相关。     

化工节能及发展趋势

通过对我国化工节能潜力的分析,阐明了化工节能的重要地位,提出了相关技术措施及建议。     

GMP实施过程中洁净车间的设计和管理

说明了在药品生产管理过程中,为了达到GMP要求,洁净车间的设计是重要的环节,而在实际的工作中,管理是否科学严格是实施GMP的关键。     

纳米Fe2O3对镁铬耐火材料烧结及力学性能的影响

在镁铬耐火材料中添加纳米Fe2O3,研究了它对镁铬耐火材料烧结性能与常温力学性能的影响.结果发现,在相同的工艺条件下,加入1%(外加)的纳米Fe2O3即可使镁铬砖的烧成温度降低150℃左右,并在相同烧成温度下能使试样的常温抗折强度和耐压强度大幅度提高.分析认为,在镁铬耐火材料中添加少量纳米级Fe2O3,可促进MgO-FeO固溶体中Cr3+和Al3+含量的提高,增强镁铬砖的直接结合程度,从而提高其力学性能.     

脉冲电流加热条件下原子的扩散研究

脉冲电流热加工(pulse electric current heat treatment,PECHT)具有低温、快速的特点。研究了脉冲电流烧结过程中温度和脉冲比对Fe烧结体性能的影响,并与相同温度、压力和保温时间下辐射加热热压烧结的Fe烧结体进行了比较。结果表明：脉冲电流烧结在较低温度下样品就能获得更高的致密度。脉冲比(ON／OFF)对烧结有很大影响,说明脉冲电流加热促进了颗粒之间的原子扩散。同时,脉冲电流加热烧结和辐射加热烧结过程中Al2O3和Cu的收缩曲线也为脉冲电流加热条件下扩散加强提供了佐证。2种加热条件下接触线之间原子扩散的研究表明：脉冲电流加热促进了原子的扩散。