CAJ | 학술논문

采用超音速电弧喷射雾化法(UASA)制备高熔点、难互溶的AgNi15复合颗粒，采用筛分法测量复合颗粒粒度分布，使用SEM、EDS和XRD分析颗粒形貌、凝固组织结构和亚稳固溶扩展。结果表明：采用UASA制备的AgNi15复合颗粒具有球形度高和分散性好的特点，直径小于74和55μm颗粒的质量分数分别为99.5%和98%。复合颗粒凝固组织结构为富镍相β(Ni)球形颗粒弥散分布在富银相α(Ag)基体中，而较大的β(Ni)颗粒中又弥散分布着α(Ag)颗粒。Ag和Ni相互实现了亚稳固溶扩展，在室温条件Ni在Ag中的固溶度在0.16%~0.3%之间(摩尔分数)。
채용초음속전호분사무화법(UASA)제비고용점、난호용적AgNi15복합과립，채용사분법측량복합과립립도분포，사용SEM、EDS화XRD분석과립형모、응고조직결구화아은고용확전。결과표명：채용UASA제비적AgNi15복합과립구유구형도고화분산성호적특점，직경소우74화55μm과립적질량분수분별위99.5%화98%。복합과립응고조직결구위부얼상β(Ni)구형과립미산분포재부은상α(Ag)기체중，이교대적β(Ni)과립중우미산분포착α(Ag)과립。Ag화Ni상호실현료아은고용확전，재실온조건Ni재Ag중적고용도재0.16%~0.3%지간(마이분수)。
Ultrasonic arc spray atomization (UASA) method was used to prepare high-melting-point, immiscible AgNi15 (mass fraction, %) composite particles. Sieving was used to determine the size distribution of the AgNi15 particles. The morphology, rapidly solidified structure and metastable solution expansion of the AgNi15 particles were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS), respectively. The results show that the AgNi15 composite particles are spherical and well-dispersed, and the mass fractions of the particles with diameters <74μm and <55 μm are 99.5% and 98%, respectively. The rapidly solidified structure of the AgNi15 particles consists of spherical nickel-richβ(Ni)-phase particles dispersed throughout a silver-richα(Ag)-phase matrix andα(Ag)-phase nanoparticles dispersed throughout largerβ(Ni)-phase particles. The silver and nickel in the AgNi15 particles form a reciprocally extended metastable solution, and the solid solubility of nickel in the silver matrix at room temperature is in the range of 0.16%?0.36% (mole fraction).