粉末冶金

This study refers to the conditions of practical powder metallurgy manufacture process, and proceeds to experiments and gear precision measurements as well as investigation on the effects of two parameters, powders and pitch circle radius, on gear precision. The relationship between gear parameters and gear surface deviations was derived from the mathematical model for the involute helical gears and the analysis of gear surface deviations.

本论文将采用实际上粉末冶金螺旋齿轮的制程条件，进行试作实验与齿轮精度的量测，以探讨粉末及螺旋齿轮之节圆半径这两个制程参数对於齿轮精度的影响；同时应用齿轮创成原理所推导之螺旋齿轮数学模式，配合齿面变异分析，求得齿轮设计参数改变量与齿面变异量之关系。

Description: 1 Knife roller material: powder metallurgy high-speed steel; 2 Diameter of knife roller: 150-250 ; 3 Speed of knife roller: 200m\min; 4 Service life of knife roller: 1 million blades per time; 5 Scope of application: paper, sanitary belt and diaper, etc; and 6 Technologies:(1) sintering and forging of powder metallurgy high-speed steel;(2) vacuum high-pressure gas-quenching heat treatment.

内容说明：1，刀辊材料：粉水冶金高速钢；2，刀辊直径： 150-250 ；3，刀辊承受速度：为200m\min；4，刀辊单次复磨使用寿命1000万片/次；5，运用范畴：纸类，卫生巾，尿裤等设备；6，需解决技术：①粉末冶金高速钢烧结和锻打②真空高压气淬热处理技术。

In the further P/M processing,gamma titanium aluminide compact with fine and homogeneous microstructure has been obtained by HIP,although elongation of the compact is poor.

在随后的粉末冶金技术研究中，运用热等静压技术得到了组织细小、均匀的粉末TiA l系金属间化合物，但材料的伸长率很低。

Results show that at 500℃ polycarbsilanedecomposed into noncrystallized SiC and free caron and impurities which hinder the densificationof the composite are also found during the above decomposition process, with the increase ofheating temperature, the noncrystallized SiC can be transformed into β-SiC.

一般传统的制备方法是，向C和SIC粉末中添加烧结助剂B，B；，A12O；；AIN等球磨混合，采用粉末冶金热压烧结；尽管采取了一些特殊的工艺手段和添加烧结助剂的方法，但该材料须在高于2000t时烧结且致密化效果较差［'1。

Personnel quality asks:(1) record of formal schooling of undergraduate course above;(2) chemical project / chemical craft / metallurgy material / pulverous metallurgy / coloured metallurgy / mineral treatment / organic chemistry / solid physics kind professional;(3) grade of professional during school class is medium reach above ;(4) have certain English / computer application foundation;(5) harmonious, communication capability is strong, group collaboration consciousness is outstanding;(6) obedient job arrangement, abide by work discipline;(7) male woman student is not restricted, the man student is first;(8) the person that working experience perhaps has paper to send souvenir to record is preferential consideration.

人员素质要求：（1）本科以上学历；（2）化学工程/化学工艺/冶金材料/粉末冶金/有色冶金/矿物加工/有机化学/固体物理类专业；（3）在校期间专业课成绩中等及以上；（4）有一定的英语/计算机应用基础；（5）协调、沟通能力强，团队合作意识突出；（6）服从工作安排，遵守劳动纪律；（7）男女生不限，男生优先；（8）有工作经验或者有学术论文发表记录者优先考虑。

The sheeted iron-based catalyst was made by powder metallurgy using pure form metallic powders as stuff.

以单质金属粉为原料，采用粉末冶金方法制备了片状铁基触媒，并借鉴目前金刚石工业中最为常用的粉末触媒组装方式及合成工艺在高温高压下进行了金刚石合成试验。

This paper presents comparisons of four technologies casting,die forging, PM forging and routine PM processing.

简要介绍并比较了用于制备汽车连杆的铸造、模锻、粉末锻造和常规粉末冶金工艺。

At the same time,three dynamic models of cylinder powder green-preform are set up ,which are :die and corefixed on the die shoe , core moving with green-preform, core and die moving downwardin relation to green-preform. The theoretical equations of the green-preform densities andpressing stresses of the three pressing conditions are also derived.

同时建立了凹模与型芯固定在下模座、型芯随压坯一起运动和型芯与凹模相对于压坯向下运动等三种圆环形粉末压坯压制的力学模型，导出了这三种压制条件下的压坯密度与压制压力的理论公式；其结果能够指导粉末冶金模具设计，为发挥模具材料的潜力提供依据。

Powder metallurgy is a leading metal forming technology. It is a high new technology to make metal and other powder into mechanical components and products by pressing, fritting and other follow-up processes.

粉末冶金是一种先进的金属成型技术，是金属及其它粉末通过加工压制成型、烧结和必要的后续处理制成机械零部件和金属制品的高新技术。

Rapidly solidified AZ91 magnesium alloy powders and the Mg-based composite material reinforced by SiC particles were produced by twin-roller atomization method and powder metallurgy, respectively. The microstructure, phase compositions and interface characterization between Mg matrix and reinforcing particles of AZ91/SiCp composite material were investigated.

摘 要：采用双辊雾化法制备快速凝固AZ91镁合金粉末，并用粉末冶金方法制备SiC颗粒增强的镁基复合材料棒材，研究AZ91/SiCp复合材料的微观组织、相组成及增强相与合金基体间的界面结构特点。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。