钛材表面无氢式一次性形成金属碳化物新方法

A Novel Method of Forming Metallic Carbide on Surface of Titanium Material with Hydrogen-Free in One Operation

发明了1种能够在钛材表面无氢式一次性形成金属碳化物的三栅极离子渗镀新方法。系统工作时所产生的等离子从空隙处直接奔向工件待处理表面,从而无氢式一次性在金属材料表面形成由镀层、或扩散层或渗镀层构成的金属碳化物表面改性合金层。利用该方法在纯钛(TA2)基材表面进行了一次性无氢式渗碳和C,Mo共渗的试验。试样的X射线衍射分析(XRD)、辉光放电分析(GDA)等测试结果表明,在钛基表面形成了具有金属碳化物及碳扩散次层的渗镀合金层,渗镀成分呈现明显的梯度分布,厚度在20μm以上,最高硬度可达13000MPa。

A novel method of a tri-cathode plasma surface alloying process was invented. Plasma from this system with desired alloying elements moves directly to the surface of a workpiece to be treated, and interacts with the surface and forms a surface alloying layer of a plating, or a diffusing alloy layer or a composite one in one operation with hydrogen-free. A surface alloying layer has been obtained on the surface of pure titanium (TA2) with carburizing and C-Mo alloying by the processing method. Characteristics of samples were examined with XRD and GDS (Glow Discharge Analysis), etc.. The result shows that a metallic carbide and carbon diffusion alloying layer forms on the surface of samples, assuming obvious gradient distribution of alloying elements. The thickness of the layer is more than 20 μ m with maximum hardness of 13 000 MPa.