低钴粗晶硬质合金的高压融渗法制备

发布时间：2018-02-07 13:44

  本文关键词： 融渗法 高压 低钴粗晶 液相钴 碳化钨骨架　出处：《高压物理学报》2017年01期 　论文类型：期刊论文

【摘要】：用含钴量为16%(质量分数)的硬质合金YG16作为基体提供钴源,对平均粒度为8μm的WC初始材料进行氢气还原脱氧处理,以减少合成样品中的杂质,通过高压融渗法烧结低钴粗晶硬质合金。重点研究了烧结压力、温度和烧结时间等条件对烧结体性能的影响,通过控制适当的工艺条件得到高硬度值的低钴粗晶合金,并对合成的硬质合金层进行X射线衍射(XRD)、扫描电镜(SEM)及硬度检测。实验结果表明,在4.5GPa、1 400℃、40min下合成样品的碳化钨晶粒形貌呈现球形或椭球形,其硬度值可达17.4GPa,表面钴含量为5.7%。
[Abstract]:In order to reduce the impurity in the synthesized samples, a cemented carbide (YG16) with cobalt content of 16 (mass fraction) was used as the base to provide cobalt source, and the initial WC material with an average particle size of 8 渭 m was treated by hydrogen reduction deoxidation in order to reduce the impurity in the synthesized samples. The effects of sintering pressure, temperature and sintering time on the properties of low cobalt coarse crystal cemented carbides were studied by means of high pressure thawing method. The low cobalt coarse crystal alloys with high hardness were obtained by controlling the proper process conditions. X-ray diffraction (XRD), scanning electron microscopy (SEM) and hardness test were carried out on the cemented carbide layer. The results showed that the morphology of tungsten carbide grain was spherical or ellipsoid at 4.5 GPa1 400 鈩，

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