采用反溶剂重结晶法试制出含有甲维盐纳米颗粒混悬液.试验中选用了表面活性剂PVP来抑制液相中颗粒的生长与团聚,并碍到了形貌较规则的甲维盐纳米颗粒.试验结果表明,降低温度和提高搅拌转速均有利于甲维盐固体小颗粒的生成,所制备的甲维盐颗粒平均粒径约378nm.

为减轻结构重量、提高机体的可靠性,复合材料和金属胶接结构得到了广泛应用。复合材料的腐蚀故障主要是脱粘,其损坏无先兆、具有突然性,对构件的安全造成致命威胁。因此对复合材料和金属胶接结构的检测是确保构件可靠工作的十分重要的问题。

Carrying capacity and mechanics performance of welding seal is greatly decided organize.In this paper,open out jointing influence rule of mechanics performance techniques parameter.As shown from test,with improving of jointing temperature and prolong of heat preservation time,welding seal organize becomes asymmetry and becomes crassitude and carrying capacity of welding seal is worst.

在再制造生产过程中做好废旧产品零部件的清洗工作是保证再制造产品质量的重要一环,不同的清洗方法和清洗质量对鉴定零件的可用性、再制造质量、再制造成本和剩余寿命都会产生重要影响。分析清洗技术在再制造过程中的重要作用,并在分析再制造过程中的清洗要求的基础上,研究当前主要适用于再制造过程的清洗技术和清洗方法,并对再制造过程中各阶段的主要清洗活动进行了描述。

以微电子技术和计算机技术为标志,以信息技术为核心的新技术革命,导致了一大批高新技术群和高新技术产业的兴起,引起了现代社会生产和生活各个领域的深刻变革。在此背景下,坦克技术也取得了前所未有的迅猛发展。本文主要从新技术新工艺新材料在第三代坦克上的运用进行了探索与研究。

To choose and confect the cladding material correctly is the key link of the technology of the electric arc cladding technology.According to the experiment of the cladding materials,the Fe-Cr-Si-B alloy powder was chosen and eonfected,and the properties of the cladding coat was tested.The results showed that the materials chosen can resist usual attrition,the high-temperature oxidation attrition and the corrosion attrition.

In engine cooling system,water is widely utilized as coolant in summer,but ethylene-glycol-type antifreezing fluid is used in winter,which would etch the frontal and latter catchment troughs significantly.In this paper, SB-99 damping anticorrosive coatings is applied.The results show that with this kind of coating,the engine water tank's corrosion resistance could be enhanced remarkably.

笔者针对渗碳淬火钢齿轮在磨齿时易产生磨削裂纹而报废的现象,通过多年的生产实践,总结和归纳渗碳淬火齿轮磨削裂纹的产生原因和防止其产生的工艺措施.

文章根据实际加工情况提出了虚拟NC车削加工系统的设计方法及实现原理,在虚拟环境下进行数控车削加工的几何仿真及物理仿真,实现产品的虚拟车削制造.

文章分析了电弧熔覆层常见缺陷位置,阐明了产生裂纹的原因,提出了在熔覆粉末中添加稀土元素的解决办法.较好地解决了熔覆层开裂问题.

Sulphurized layer was produced on the surface of CrMoCu alloy cast iron by means of low temperature ion sulphurization process with thickness of about 5 μm.The sulfide globular grains distribute evently on the surface,and their size is in micron-scale.The phase structure of the sulphurized layer is mainly composed of FeS.Under the high speed and heavier loading condition,the sulphurized surface exhibited lower friction coefficient than plain surface evidently,and it greatly reduced the tendency of adhesion of the material and it improved the scuffing-resistance of the material.Under the synergistic effect between sulphurized layer and with sulphur additive,CrMoCu alloy cast iron exhibited much more excellent friction-reducing and wear-resistance due to chemical reaction films including molybdenum compound,phosphate and sulphide.