氮在硼氮复合渗中的作用

分析并试验研究了氮对渗硼层浓度、显微硬度、相结构的影响。结果表明，当氮的加入量为质量分数2%时，氮的渗入对后续渗硼过程的阻碍作用，而当添加量为5%时，氮对渗硼有催渗作用。此外，氮的渗入有利于强化过渡区，从而使硬度梯度变缓，有利于得到单一的Fe2B相。     

Effect of Plasma Boronitriding on Diamond Nucleation and Growth onto Cemented Carbide Substrates

Plasma boronitriding has been successfully employed to overcome the difficulty in diamond growth on ferrous-based substrates,Commercial cobalt-sintered,tungsten-cemented carbides(WC (Co) were pretreated by a plasma boronitriding method,diamond was then deposited by microwave-enhanced chemical vapor deposition (MPCVD) ,The deposited films were characterized by scanning electron microsopy and Raman spectroscopy,Conitinuous diamond films with a sharp characteristic Raman Peak of 1334 cm^-1 were grown and adhered well on the boronitrided region of the cemented carbide substrates,On,the other hand,a mixture of diamond crystallites,amorphous carbon and graphitic carbon was loosely deposited on the unboronitrided region A cobalt inert thin layer formed after plasma bornitriding pretreatment enabled the subsequent nucleation and growht of a high-quality CVD iamond.     

硼氮共渗提高5CrMnMo钢热锻模使用寿命的研究

通过对 5CrMnMo钢试样进行硼氮共渗热处理工艺试验研究 ,确定了提高 5CrMnMo钢制热锻模使用寿命的硼氮共渗处理工艺 ,并与渗硼层相比较 ,结果表明 ,其共渗层具有更优良的耐磨性和耐高温氧化性。与等温处理相比 ,共渗后经等温处理的热锻模使用寿命可提高 2倍以上     

奥氏体不锈钢硼氮共渗渗层组织结构的研究

研究了奥氏体不锈钢硼氮共渗渗层及过渡区组织结构,并对共渗机理进行了探讨。结果表明,渗硼层硼化物为(FeM)B和(FeM)_2B,渗层平坦无齿状插入。硼的渗入使奥氏体不锈钢γ相区的A_1线和A_3线上升到室温以上,在硼的固溶区形成α相。硼化层中的黑色密集带是α相与细密的硼化物共存时易于腐蚀的结果。     

氮在硼氮复合渗中的作用机理

分析研究试验了氮对渗硼层深度、显微硬度、相结构的影响.结果表明,当氮的加入量为1.5wt%时,氮的渗入对后续渗硼过程有阻碍作用,而当添加量为5wt%时,氮对渗硼有催渗作用;另外,氮的渗入有利于强化过渡区,从而使硬度梯度变缓,有利于得到单一的Fe2B相.     

加稀土硼氮共渗提高烟机配件使用寿命的研究

用正交试验法确定了加稀土硼氮共渗工艺参数及稀土加入量，用金相显微镜、X射线衍射仪及SAM观察和分析了渗层组织、相结构及微区成分；将加稀土硼氮共渗样与硼氮共渗样进行磨损试验，结果表明：加稀土后耐磨性能明显提高；渗层脆性及硼化物致密度得到改善；渗层中碳、氮含量提高，增强了硼化物与基体的结合强度。生产实践表明：加稀土硼氮共渗的使用寿命较普通硼氮共渗处理的提高20％。