利用水雾化Fe70Ni30合金粉或Fe70Mn25Ni5合金粉与石墨原料混合,经过还原与净化处理、造粒和压制成合成柱,用于自锐性金刚石(Self Sharpening Diamond,SSD)的合成,研究了粉末触媒法自锐性金刚石的合成工艺条件。研究结果表明,不同触媒组分对合成后金刚石的形貌有明显影响;根据优化的SSD合成工艺参数,可以稳定自锐性金刚石单次产量在90ct以上。用SSD金刚石制成树脂结合剂砂轮应用于磨削时磨削力小,粗糙度低。

Self-sharpening diamonds were synthesized using the mixture of water atomized FeNi or FeMn alloy and graphite powders as raw materials,which were reduced and puri-fied,granulated,then compressed,to prepare powder catalyst capsule.The synthesis conditions of the diamonds were researched in detail.It was shown that different powder catalyst apparently influenced the morphology of diamonds,in which the yield of diamond using Fe70 Ni30 was higher than that using Fe70 Mn2 5 Ni5 as catalyst,and the yield per time obtained generally was 90ct and could reach a maximum value of 127.9ct.Under the con-dition of the grinding efficiency,the grinding force and roughness of resin grinding wheels made with SSD diamonds were lower than those of the ones made with ordinary dia-monds.

在铜基体表面电沉积铜-金刚石复合过渡层，采用电镀铜加固突出基体表面的金刚石颗粒，最后利用热丝化学气相沉积（HFCVD）法在复合过渡层上沉积大面积的与基体结合牢固的连续金刚石膜。采用扫描电子显微镜、拉曼光谱和压痕试验对所沉积的金刚石膜的表面形貌、内应力及膜/基结合性能进行研究。结果表明：金刚石膜由粗大的立方八面体颗粒与细小的（111）显露面颗粒组成，细颗粒填充在粗颗粒之间，形成连续的金刚石膜。复合过渡层中的露头金刚石经 CVD 同质外延生长成粗金刚石颗粒，而铜表面与粗金刚石之间的二面角上的二次形核繁衍长大成细金刚石颗粒。金刚石膜/基结合力的增强主要来源于金刚石膜与基体之间形成镶嵌咬合和较低的膜内应力。

Large area diamond films were fabricated on copper substrates by a multi-step process comprised of electroplating Cu-diamond composite layer on Cu substrate, plating a Cu layer to fix the protruding diamond particles, and depositing continuous diamond film on composite interlayer by hot-filament chemical vapor deposition (HFCVD). The interface characteristics, internal stress and adhesion strength were investigated by scanning electron microscopy, Raman analysis and indentation test. The results show that the continuous film without cracks is successfully obtained. The microstructure of the film is a mixture of large cubo-octahedron grains grown from homo-epitaxial growth and small grains with (111) apparent facets grown from lateral second nuclei. The improved adhesion between diamond film and substrate results from the deep anchoring of the diamond particles in the Cu matrix and the low residual stress in the film.

利用磁化率测定仪、扫描电镜/X射线能谱仪、氧氮分析仪等仪器综合分析了使用铁镍合金触媒合成的磨料级系列金刚石内部杂质及其组分与含量。结果表明：人造金刚石磁化率与灰分/金刚石质量比成正比。人造金刚石的主要杂质为铁、镍、镁、硅、钙、氧和氮。随着人造金刚石杂质总量的减少,除氮以外所有杂质都在减少,但杂质中的硅和钙的占比增加,提示硅和钙除了随同触媒一道,以金属包裹体的方式进入金刚石晶体,可能还有其他方式。金刚石品级越高,氧质量分数越低,而氮质量分数与品级高低无关。为进一步考察金刚石杂质来源,分析了合成金刚石试样所使用的原料石墨和触媒。使用高纯度石墨和触媒有助于合成出高纯度金刚石,但不一定是顶级金刚石。

The impurities in a series of abrasive diamonds synthesized by using iron and nickel alloy as catalyst,ranging from low grade to high grade,were investigated by employing magnetic susceptibility tester,SEM/EDS and oxygen nitrogen analyzer.The results show that magnetic susceptibility of synthetic diamond is proportional to the mass ratio of the diamond ash and the diamond itself.The main impurities in the synthetic diamond are iron, nickel, magnesium, silicon, calcium, oxygen and nitrogen.With the decrease of the total amount of impurities in the diamond,all of the impurities except for nitrogen decrease,but share of silicon and calcium increase.This fact implies that there may be another way for silicon and calcium get into the diamond lattice in addition to accompanying metal inclusions.The higher the diamond grade the lower the oxygen mass fraction,while the nitrogen mass fraction shows no relationship with diamond grade.To further investigate the origin of impurities in the diamond

在引进的韩国微波等离子化学气相沉积(MPCVD)设备中,利用氢气和甲烷作为气源,在单面抛光的(100)单晶硅片上研究了不同的形核温度和生长温度条件下制备出金刚石薄膜。通过Raman光谱、XRD光谱和扫描电子显微镜(SEM)对制备的金刚石膜的质量进行表征。研究结果表明,形核温度和生长温度对金刚石膜的生长均有影响。形核温度过低会增大薄膜中的非金刚石相的含量,促使二次形核增加,降低了金刚石薄膜质量。随着生长温度的升高,金刚石中非金刚石相含量越少,金刚石的质量提高,但金刚石的晶面同时也被大量刻蚀。

Diamond thin film have been deposited in different nucleation temperature and growth temperature onto sili-con (100 ) substrates using a gas mixture of methane and hydrogen by a microwave plasma chemical vapor deposition ( MPCVD) from .The quality of diamond film was characterized by Raman spectrum respectively , X-ray diffraction ( XRD) patterns and scanning electron microscopy ( SEM) .The experimental results show that the different nucleation temperature and growth temperature are important for the quality of diamond.When the nucleation temperature decreases, the content of non-diamond and secondary nucleation increases .As the growth temperature increases , the content of non-diamond phase is less, the quality of the diamond was improved, but a large number of diamond crystal faces was etched at the same time.

采用自制的实验模具,将金刚石锯片放置于脉冲磁处理仪器下进行磁处理。对金刚石锯片在脉冲磁场作用下的性能影响进行理论分析,检测磁处理前后金刚石锯片不同点处的残余应力值,分析磁处理后的金刚石锯片与未经磁处理的金刚石锯片的断口形貌。研究结果表明：磁处理后的金刚石锯片残余应力降低,断口处微观组织得到细化,说明脉冲磁处理可以有效改善金刚石锯片的力学性能。

Diamond saw blade are treated with pulsed magnetic field using self-made experiment dies. Influence of magnetic treatment on blade performance was analyzed and residual stress on different points of the blade was investigated.The microstructures both before and after the magnetic experiment were studied.Results revealed that magnetic treatment could reduce the residual stress of diamond saw blades and make alloy organize become more uniformity.It showed that pulsed magnetic treatment might improve the mechanical properties of diamond saw blades.