梯度硬质合金截齿的开发与应用

Development and Applications Picks of Gradient Cemented Carbide

硬质合金由于具有硬度高、抗压能力强、耐磨性好等优异性能,在地质矿山凿岩工具上得到了广泛应用。传统硬质合金的韧性与耐磨性是相互矛盾的性质,而梯度硬质合金技术能在硬质合金的表面形成一层含钴量低、硬度较高的梯度层,形成了外硬内韧的材料结构,既提高了合金表面的耐磨性,又保持了合金整体韧性,很好地解决了合金耐磨性与韧性之间的矛盾。本文介绍了一种新型功能梯度合金的研制,有别于以往Sandvik的缺碳梯度合金制备方法,使得梯度合金的制备工艺大大简化,并提高了梯度合金的可控性与可靠性。通过在美国亚利桑那州工地现场测试,取得了理想的使用效果。

duo to its high hardness, great compressive capacity and excellent wear resistance, the cemented carbide has extensive applications on rock drilling machines in mines. Toughness and wear-resistance are a pair of conflicting properties in traditional cemented carbides, while the gradient cemented carbide technology can create a gradient case of low-Co and high hardness on the surface of the cemented carbide. Thus, a microstructure with hard surface and tough core is produced, not only increasing the wear resistance of the alloy surface but also maintaining the overall toughness of the alloy. It effectively eliminates the contradiction between the wear resistance and toughness of the alloy. A new type of research and development process of the gradient alloy is proposed in the paper, which is different from the carbon-deficient cemented carbide production process from Sandvik. This process simplifies the production process of the gradient alloy greatly and improves the controllability and stability of the gradient alloy. After being tested on construction sites in Arizona, US, the gradient alloy provides us with ideal results.