高硅铝合金粉末制备工艺及其综合性能分析

Preparation Process and Comprehensive Performance Analysis of High Silicon Aluminum Alloy Powder

由于液相烧结工艺升温较快,材料性能较差,因此,对高硅铝合金粉末制备工艺及其综合性能进行分析研究。选用较低的浇筑温度,加入变质剂,得到大量初态硅。在原料表面加入碳,获得不同体积和孔径大小的试验样本材料,在样本材料中加入高硅铝合金。运用液相烧结来加强原料的紧实度,通过颗粒重新排列,补充液体的相对间隙。对粉末进行包套,运用扩散设备对包套内粉体进行排气,完成制备。测试结果表明:烧结升温曲线比液相烧结曲线多出两个温度点,升温速率减慢,孔隙率降低,材料致密度得到提升。

Due to the rapid temperature rise and poor material properties of the liquid phase sintering process,the preparation process and comprehensive properties of high silicon aluminum alloy powder were analyzed and studied.Select a lower pouring temperature and adding a modifier to obtain a large amount of initial silicon.Add carbon to the surface of the raw material to obtain test sample materials with different volumes and pore sizes,and add high silicon aluminum alloy to the sample materials.Use liquid phase sintering to enhance the compactness of raw materials,and supplement the relative gap of the liquid through particle rearrangement.Wrap the powder and use diffusion equipment to exhaust the powder inside the package to complete the preparation.The test results show that the sintering temperature rise curve has two more temperature points than the liquid phase sintering curve,the heating rate slows down,the porosity decreases,and the material density is improved.