The results indicated that more perfect alloy powders was obtained by attritor mechanical milling with upper efficiency . nd2fe14b grain refined quickly with increasing milling time and disappeared 实验结果表明:搅拌式球磨较行星式球磨更能获得理想的合金粉末,且具有比较高的效率。
And generally speaking , the grain sizes were all less than 100nm . the average grain sizes of nd2fe14b and - fe reached a minimum of sizes after crystallization treatment ( temperature of crystallization : 650 ; heat preservation time : 5 hours ) 对球磨5小时的合金粉末进行晶化处理,可以发现,在晶化过程中,随晶化温度的增加晶粒尺寸逐渐长大,但总体来说,都在100nm以下。
In this paper , metastable cu - al alloy powder with different aluminum content was prepared by mechanical alloying technique . high strength and high conductivity cu - al2c > 3 composites were prepared by a new type vacuum internal oxidation technique 本文采用机械合金化法制备了不同铝含量的亚稳态的cu - al合金粉末，采用新型真空内氧化工艺制备了不同成分的高强度高导电cu - al2o3复合材料。
The high alloy and metal ceramic valve seats and valve guide manufactured by ourselves can satisfy the requirements of unleaded gasoline , diesel oil and natural gas engines , and also can apply to the requirements of natural air admission and various pressurization intensification engines 公司生产的高合金粉末冶金气门座和气门导管能满足无铅汽油机柴油机天然气发动机需要，也能满足自己吸气及各种增压强化发动机需要。并可根据客户要求来样加工。
The condition which the internal oxidation reaction of cu - al alloy can take place has been studied ; technique parameters have been set on the basis of theoretical analyze ; different factors which can affect the microstructure and properties of cu - al2o3 composites have also been discussed . the ambient temperature properties and the thermal stability of composites were tested . several electrical conductivity models were optimally selected to calculate the electrical conductivity of cu - ahoa composites . the results showed that : 1 研究了cu - al系合金粉末发生内氧化所需的条件，根据理论分析制定出相应的工艺参数；分析研究了各种影响cu - al2o3复合材料组织与性能的因素；测试了本课题制备的cu - al2o3复合材料的室温性能，热稳定性能；优选了适合cu - al2o3复合材料的电导模型。
The feasibility of copper matrix reinforced by cr2o3 particles was discussed from the aspect of the demand of composite on reinforcer , interface and its formation . crcu alloy powders prepared by water atomization were turned into cr2o3 / cu compound powders , which were made into composites 本文从复合材料对颗粒增强相的要求、复合材料的界面以及复合材料的成型等角度分析了cr _ 2o _ 3颗粒作为弥散强化相增强铜基体的可行性，采用水雾化法制备crcu合金粉末，并通过预氧化的方法得到cr _ 2o _ 3 cu复合粉末，运用粉末冶金法制备cr _ 2o _ 3 cu复合材料。
The researching work include three aspects : 1 ) after selecting primary material system , the polymer coating process were optimized . the polymer - coated high - temperature alloy powder has been developed on the basis . 2 ) based on sintering and orthogonal experiments , the influence of the prototyping elements on prototyping properties have been initially studied , and the optimal prototyping parameters of this material has been obtained finally 本文主要研究内容为： ( 1 )选择合适的包覆材料体系，对钼粉的包覆工艺进行了优化实验，在此基础上开发了适合于激光烧结成型用覆膜高温合金粉末材料； ( 2 )通过激光烧结成型实验，运用正交实验方法，系统地研究了烧结工艺参数对成型质量的影响关系，在此基础上确定了覆膜高温合金粉末最佳烧结成型工艺参数； ( 3 )对激光成型件进行了后处理工艺实验，得到了优化的后处理工艺规程，并制作了合格的后处理样件。
Under the background of correlative research project , the method of selective laser sintering has been used in the researching work . polymer - coated high - temperature alloy powder have been first developed successfully in our nation . the laser sintering and post - treatment process of high - temperature alloy parts have been systematically studied , which lay the foundation for its engineering application 在国内首先研制成功了覆膜高温合金粉末及其制备工艺，并对其激光烧结成型和后处理工艺进行了系统的实验研究，为该项技术的工程化应用打下了基础。
And the alloy powders distributed symmetrically with powders size of about 0 . 2 - 0 . 3 m . the crystallization behavior of amorphous nd2fe14b powders with mechanical milling 5 hours was studied . during the process of crystallization treatment , the average grain sizes of the alloy powders were growing with increasing temperature of crystallization 搅拌式球磨5h后,合金粉末颗粒尺寸较细在0 . 2 - 0 . 3 m ,分布比较均匀,并且由非晶相nd2fe14b和晶粒尺寸约为10nm的- fe组成。
Being fine , homogeneous and free of melting , the powder prepared by mechanical alloying has applied to develop scattering strengthen - material , magnetic material , high - temperature material , superconductivity material , amorphous , and non - equilibrium material , compound material etc . as a high - tech technology to prepare alloying powder , ma has become a more and more important method for preparing new materials 机械合金化法制备的粉末晶粒细小、成分均匀，且能避免熔化过程，已用于开发研制弥散强化材料、磁性材料、高温材料、超导材料、非晶、准晶、纳米晶等各种状态的非平衡材料、复合材料、轻金属高比强材料、储氢材料、过饱和固溶体等。作为制备合金粉末的非平衡高新技术，越来越成为一种制备新材料的重要方法。
