采用四种不同的等静压工艺＋相同的中频烧结工艺制备出直径75mm、高度100mm的试棒，烧结完成后测试整体密度，并测试所存留圆柱体密度，接着再进行车削及密度测试，如此循环，最后得到试棒的芯部。密度采集方案：试样先在空气中称重，然后在液体中称重，通过计算得出密度。

Four different isostatic pressing processes + the same intermediate frequency sintering process are used to prepare test bars with a diameter of 75 mm and a height of 100 mm. After the sintering is completed, the overall density is tested, and the density of the remaining cylinder is tested, and then turning and density testing are performed. Loop, and finally get the core of the test bar. Density collection scheme: The sample is first weighed in the air, then in the liquid, and the density is calculated.