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，然后对试棒两头及棒身进行车削加工，以去除试棒外围部分，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。金相组织采集方案：试样经过机械磨削和抛光成平整、光亮、无磨痕或抛光划痕的镜面，采用10-20%的氢氧化钠+铁氰化钾混合液（氢氧化钠与铁氰化钾质量比为1:1）对样品进行腐蚀，腐蚀后的样品在金相显微镜下放大100×或200×进行组织观察，采用线性截距法来测量晶粒尺寸大小。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。显微硬度采集方案：试样经过机械磨削和抛光成平整、光亮、无划痕的镜面，然后水平稳固地放在刚性支承台上，在没有冲击或振动的情况下，把压头垂直压入试样的被测表面，直到施加的试验力达到规定的数值为止，施加试验力的时间为2s～8s，试验力保持时间为10s～15s。

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 then both ends and the body of the test bar are turned to remove the periphery of the test bar. Part, and test the density of the remaining cylinder, then carry out turning and density test, and so on, and finally get the core of the test bar. Metallographic structure collection plan: The sample is mechanically ground and polished to a smooth, bright, and no-wear or polished scratched mirror surface, using a 10-20% sodium hydroxide + potassium ferricyanide mixture (sodium hydroxide and potassium ferricyanide) The mass ratio of potassium ferricyanide is 1:1) The sample is corroded, and the corroded sample is magnified 100× or 200× under a metallurgical microscope to observe the structure, and the linear intercept method is used to measure the grain size. Density collection scheme: The sample is first weighed in the air, then in the liquid, and the density is calculated. Micro-hardness collection scheme: The sample is mechanically ground and polished into a smooth, bright, and non-scratched mirror surface, and then placed on a rigid support table horizontally and firmly, and the indenter is pressed vertically without impact or vibration. Insert the tested surface of the sample until the applied test force reaches the specified value. The time for applying the test force is 2s to 8s, and the test force retention time is 10s to 15s.