CAJ | 학술논문

以平均粒径为20μm的自制高纯LaB6粉末为原料，采用低压固相烧结工艺制备高致密度LaB6多晶体，考察了压制时间、压力与致密度的关系，并探讨了致密度对材料性能的影响。实验结果表明：一次热压制备内径Φ30 mm高致密度LaB6多晶体工艺参数为：烧结温度2000℃、热压压力5 MPa、热压时间2 h。在此条件下，产品相对致密度可达到95．9％，抗弯强度为154 MPa，洛氏硬度为87，空心阴极发射电流大于10 A/cm2。该工艺与其它制备工艺相比，设备要求低，产品相对致密度高，具有广阔的工业应用前景。
이평균립경위20μm적자제고순LaB6분말위원료，채용저압고상소결공예제비고치밀도LaB6다정체，고찰료압제시간、압력여치밀도적관계，병탐토료치밀도대재료성능적영향。실험결과표명：일차열압제비내경Φ30 mm고치밀도LaB6다정체공예삼수위：소결온도2000℃、열압압력5 MPa、열압시간2 h。재차조건하，산품상대치밀도가체도95．9％，항만강도위154 MPa，락씨경도위87，공심음겁발사전류대우10 A/cm2。해공예여기타제비공예상비，설비요구저，산품상대치밀도고，구유엄활적공업응용전경。
High-density LaB6 polycrystalline bulks were fabricated by low-pressure solid-state sintering using self-prepared LaB6 powder with an average particle size of 20μm. An investigation was made on the relationship between the pressing time, pressure and density. The influence of density on material properties was studied as well. The results show that the process parameters for once hot pressing of high-density LaB6 polycrystalline ofΦ30 mm are as follows:sintering temperature of 2 000 ℃, sintering pressure of 5 MPa and holding time of 2 h. Under such conditions, the relative density, bend strength, Rockwell hardness and hollow cathode emission density of the LaB6 polycrystalline are 95.9%, 154 MPa, 87 and more than 10 A/cm2, respectively. Compared with other preparation processes, this process with lower requirements for the equipment can bring products with higher relative density, presenting a broad prospect for industrial applications.