大尺寸高相对密度钨管制品对于石英熔炼行业具有重要的应用价值，为了克服大尺寸钨管在制备过程中易出现压坯开裂和相对密度不高的问题，对不同粒度钨粉进行了掺混实验，研究了混合时间对压坯强度的影响。研究表明，对掺混钨粉进行气流破碎处理，可以有效地缩小粒度分布范围，提高颗粒均匀性。通过对压制压强和保压时间的研究，发现压制压强>230 MPa 时，延长保压时间或提高压制压强并不会提高压坯强度。通过慢速升温烧结实验，发现钨管收缩率较大的温度集中在1600 ℃ 以下，延长中低温烧结时间可以较好的提高钨管的相对密度。

Large size and high relative density tungsten tube products have important application value for the quartz smelting industry. In order to overcome the problems of green compact cracking and low relative density during the preparation of large size tungsten tubes, tungsten powders of different particle sizes have been blended. Experiment to study the effect of mixing time on the strength of the compact. Studies have shown that airflow crushing treatment of blended tungsten powder can effectively reduce the particle size distribution range and improve particle uniformity. Through the research on the pressing pressure and holding time, it is found that when the pressing pressure is >230 MPa, extending the holding time or increasing the pressing pressure will not increase the strength of the green compact. Through the slow heating sintering experiment, it is found that the temperature of the tungsten tube with a large shrinkage rate is concentrated below 1600 ℃, and the relative density of the tungsten tube can be improved by extending the medium and low temperature sintering time.