ˮ�ཬ������������Ƽ�����Ľ�������о�

解决注水泥作业的防气窜问题，是提高固井质量，保护油气层的关键技术。现有预测和防止水泥浆气管理的方法虽然较多，但应用于现场却有一定困难，主要表现在所考虑的因素比较单一，有些高温、高压下的水泥浆性能参数难以测定。文章在分析国内外预测和防止气窜方法的基础上，应用水泥浆浆体在环空的组成，GFP系数、水泥浆稠度阻力系数（A）及多凝水泥和环空加压等措施，拟定出一套提高水泥浆顶替效率，保证水泥浆动态和静态过程压力平衡关系的具体设计方法。     

改进渣浆泵过流件铸造工艺及硬度的措施

介绍了渣浆泵过流件材质的化学成分及其正交试验的优选过程，以及重新制定的铸造工艺。     

过共晶铝硅合金半固态浆料表观粘度研究

通过自制的双筒旋转粘度计对过共晶ZL117合金的表观粘度进行了研究。结果表明,随着保温温度的降低,即固相率的升高,ZL117合金浆料的表观粘度随之增加;随着搅拌电流的增加,其表观粘度先降低,在搅拌电流为14A左右时达到最低,然后增大;随着冷却速度的增大,其表观粘度增大。     

SOME ASPECTS OF THEORETICAL COMPARISON OF FISCHER-TROPSCH REACTORS

The reactor systems used for the Fischer-Tropsch synthesis, fixed bed, fluidized bed and slurry bed, are compared on the basis of space time yield (STY) and level of conversion obtainable under the same set of feed and operating conditions. The slurry bed and fluidized bed reactor were compared on the basis of a first order reaction model. The performance of these two reactors was found to be comparable at low values of WHSV, but at higher values of WHSV, the fluidized bed reactor gave higher conversions and STY. A power law kinetic expression was used to compare the performance of the slurry bed and fixed bed reactors. Higher conversions and STY were obtained from the fixed bed with varying WHSV. This may be due to the omission of the intra and inter phase mass transfer resistances in the modelling of the fixed bed reactor.     

基于RP的快速精密铸造工艺的研究

研究了用立体光刻快速原形作为模的精密铸造的型壳制造工艺。结果表明,用石英粉100、三聚磷酸钠3、锂基膨润土2、PVB溶液7、微量的JFC和适量的甲醇,充分搅拌,制得耐火浆料。在模的表面浸涂耐火浆料并撒石英砂数次,直至结成5~10 mm厚的型壳。在35℃烘箱内烘干8~10 h,300℃装炉,以300℃/h升温到950℃,保温30 min,即得浇注所需型壳。将石英粉换为其它耐火粉料并对配比略加调整,即可制得其它耐火粉料的型壳,用于其它合金的铸造。     

液流混合处理对半固态A357浆料组织的影响

研究了用液流混合方法(CRP)制备A357半固态浆料时,液流混合、熔体温度和反应器温度等因素对浆料组织的影响。试验结果表明,熔体经过反应器的强制混合后,形成的半固态浆料内部初生相呈细小的近球状,与未经处理的浆料组织相比有显著差异。而低的熔体温度和反应器温度(熔体温度不高于640℃,反应器温度低于300℃)有利于减小初生相尺寸,促进其形成近球状。进一步的分析表明液流混合影响了金属熔体的形核与生长过程,进而改变了凝固组织。     

金精矿矿浆电解过程中矿粒及Fe(Ⅱ)的阳极氧化

研究了在云南元阳金精矿矿浆电解过程中 ,矿粒及Fe(Ⅱ )在石墨阳极上氧化过程动力学 ,测绘了矿粒及Fe(Ⅱ )在石墨阳极上的极化曲线 ,发现矿粒的阳极氧化分为 3个阶段。研究了各种因素对Fe(Ⅱ )阳极氧化电流密度的影响 ,并求出Fe(Ⅱ )阳极氧化过程的动力学参数 ,在 2 5～ 2 8℃时 ,i0 在 ( 3 1 6～ 6)× 1 0 - 5A·cm- 2 之间 ,k为 4 37× 1 0 - 1 2 ～ 1×1 0 - 8cm·s- 1 。     

Evaluation of erosive wear resistance of TiN coatings by a slurry jet impact test

In this paper, it is proposed to use a new type of solid particle impact test (slurry jet) to swiftly evaluate wear properties of thin, single layered or multilayered coatings. By the slurry jet, 1.2 μm alumina particles were impacted at high velocity perpendicular to thin PVD coatings of TiN deposited on high speed steel substrate materials under various substrate temperatures. Since the coatings have a much higher wear resistance than the substrate material, the wear rate increases significantly to the higher level of the HSS material when the coatings are penetrated. This is utilized in the quantification of the assessment of coating wear. A ranking of wear resistance and correlations to the coating surface hardness measured by nano-indentation tests, and coating morphology and structures are given and discussed. The TiN deposited under the highest substrate temperature proved to have the highest wear resistance although it had a relatively low hardness. The wear rate of the TiN coatings varies with the orientation of grains, that is, the {1 1 1} orientation that dominates for the high temperature deposition shows a higher wear resistance than the {1 0 0} orientation, which corresponds with the cleavage fracture behavior. Thus, it can be recommended as a screening test when evaluating coatings and coated materials.