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最近美国Dynamet技术公司研制出碳化钛增强二元钛基复合材料阀门,并获得专利。该阀门的生产工艺是,先将粉末和颗粒混合,然后冷等静压到接近最后成形,再用真空烧结法使得到的预制件的密度达到理论值的95％,最后再通过热等静压使预制件达到完全密实。 为了提高阀头的耐磨性,阀头中的增强剂含量要高于阀杆中。阀杆中的增强剂含量少,是为了得到所需的高刚度和耐疲劳性。增强剂含量不同的两种复合材料是用扩散法粘结在一起的。
Recently, the United States Dynamet technology company developed a titanium carbide reinforced binary titanium-based composite valve, and patented. The valve is produced by mixing the powder and the particles first and then isostatically isostatically cooled until the final shape is achieved and the resulting preform is vacuum sintered to a density of 95% of the theoretical value and finally to the hot isostatic pressing Preform to achieve complete density. In order to improve the wear resistance of the valve head, the content of the reinforcing agent in the valve head is higher than that in the valve stem. The amount of reinforcing agent in the stem is small to achieve the desired high stiffness and fatigue resistance. The two composites with different intensifier contents are bonded together by diffusion method.