机械合金化对WZrZn合金冲击反应特性的影响

Effect of mechanical alloying on impact initiated reaction characteristics of WZrZn alloy

摘要:

W具有高的热惯性以及低的绝热火焰温度，导致其在空气中难以燃烧。为改变W的燃烧特性，本文通过机械合金化将20 wt.%的Zr引入W中。XRD、SEM及STEM分析表明，球磨30 h后，Zr的衍射峰完全消失，得到了单相BCC结构的W(Zr20)超饱和固溶体合金粉末。在此基础上，以Zn粉作为粘结剂，采用热压工艺制备WZrZn合金。准静态力学性能测试和弹道枪实验结果表明，以W(Zr20)合金粉末为原料制备的W(Zr20)-Zn30合金的抗压强度和能量释放特性明显优于机械混料制备的W/Zr20-Zn30合金。在1200 m/s的冲击速度下，W(Zr20)-Zn30合金的反应超压达到0.21 MPa，能量释放特性优异。同时，在反应产物分析中，发现大量钨的燃烧产物WO3，表明Zr的固溶诱发了W的燃烧反应，有效提高了WZrZn合金的冲击反应特性。

Abstract:

W has high thermal inertia and low adiabatic flame temperature, which makes it difficult to burn in air. To change the combustion characteristics of W, 20 wt.% Zr was introduced into W by mechanical alloying. XRD, SEM and STEM analysis showed that after ball milling for 30 h, the diffraction peak of Zr disappeared completely, and the W(Zr20) super-saturated solid solution powders with single BCC phase were obtained. Subsequently, WZrZn alloys were prepared by hot pressing with Zn powder as binder. The results of quasi-static mechanical properties tests and ballistic gun experiments showed that the compressive strength and energy release characteristics of W(Zr20)-Zn30 alloy prepared by W(Zr20) alloy powder were significantly better than those of W/Zr20-Zn30 alloy prepared by conventional mechanical mixing. Under the impact velocity of 1200?m/s, the reaction overpressure of W(Zr20)-Zn30 alloy reached?0.21 MPa.?In the analysis of reaction products, a large amount of WO3 were found, indicating that the solid solution of Zr induced the combustion reaction of W, which effectively improved the impact initiated reaction characteristics of the WZrZn alloy.