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Purification method of silicon nitride ceramic material
The invention provides a purification method of a silicon nitride ceramic material, and belongs to the field of nano ceramic materials. The preparation method comprises the following steps: mixing nano silicon powder, a silicon nitride ceramic material, a sintering aid and a phosphoric acid compound, and carrying out wet ball milling to obtain a mixture; and sintering the mixture in a nitrogen atmosphere. According to the invention, the sintering aid forms lithium oxide and does not generate other solid impurities when being sintered in nitrogen, and in the sintering process, active lithium element is utilized to assist the fracture and generation of Si-N chemical bonds, so that the atomic diffusion coefficient in the silicon nitride powder in the sintering process is improved, and the conversion of silicon nitride from an alpha phase to a beta phase is promoted; the sintering aid is added into the silicon nitride powder, the sintering performance of the silicon nitride powder is improved, growth of beta-phase silicon nitride grains is promoted, a silicon nitride ceramic sintered body can be prepared, and due to the addition of the phosphoric acid compound, the sintering aid and the phosphoric acid compound enable the nanometer silicon powder to be nitrided to generate the silicon nitride nanowires in the sintering process at a relatively low temperature; the high-purity silicon nitride ceramic material is obtained.
本发明提供了一种氮化硅陶瓷材料的提纯方法，属于纳米陶瓷材料领域。将纳米硅粉、氮化硅陶瓷材料、烧结助剂和磷酸化合物混合进行湿法球磨，得到混合料；将所述混合料在氮气气氛中进行烧结。本发明中，所述烧结助剂在氮气中烧结时形成氧化锂，不产生其他固体杂质，在烧结过程中利用活泼的锂元素辅助Si‑N化学键的断裂与生成，提高烧结过程中氮化硅粉体中的原子扩散系数，促进氮化硅由α相向β相转变，提高氮化硅粉体的可烧结性能，且促进β相氮化硅晶粒长大，不仅能够制备得到氮化硅陶瓷烧结体，而且由于磷酸化合物的加入，烧结助剂与磷酸化合物在较低温度下，使纳米硅粉在烧结过程中氮化生成氮化硅纳米线，获得高纯度的氮化硅陶瓷材料。
Purification method of silicon nitride ceramic material
The invention provides a purification method of a silicon nitride ceramic material, and belongs to the field of nano ceramic materials. The preparation method comprises the following steps: mixing nano silicon powder, a silicon nitride ceramic material, a sintering aid and a phosphoric acid compound, and carrying out wet ball milling to obtain a mixture; and sintering the mixture in a nitrogen atmosphere. According to the invention, the sintering aid forms lithium oxide and does not generate other solid impurities when being sintered in nitrogen, and in the sintering process, active lithium element is utilized to assist the fracture and generation of Si-N chemical bonds, so that the atomic diffusion coefficient in the silicon nitride powder in the sintering process is improved, and the conversion of silicon nitride from an alpha phase to a beta phase is promoted; the sintering aid is added into the silicon nitride powder, the sintering performance of the silicon nitride powder is improved, growth of beta-phase silicon nitride grains is promoted, a silicon nitride ceramic sintered body can be prepared, and due to the addition of the phosphoric acid compound, the sintering aid and the phosphoric acid compound enable the nanometer silicon powder to be nitrided to generate the silicon nitride nanowires in the sintering process at a relatively low temperature; the high-purity silicon nitride ceramic material is obtained.
本发明提供了一种氮化硅陶瓷材料的提纯方法，属于纳米陶瓷材料领域。将纳米硅粉、氮化硅陶瓷材料、烧结助剂和磷酸化合物混合进行湿法球磨，得到混合料；将所述混合料在氮气气氛中进行烧结。本发明中，所述烧结助剂在氮气中烧结时形成氧化锂，不产生其他固体杂质，在烧结过程中利用活泼的锂元素辅助Si‑N化学键的断裂与生成，提高烧结过程中氮化硅粉体中的原子扩散系数，促进氮化硅由α相向β相转变，提高氮化硅粉体的可烧结性能，且促进β相氮化硅晶粒长大，不仅能够制备得到氮化硅陶瓷烧结体，而且由于磷酸化合物的加入，烧结助剂与磷酸化合物在较低温度下，使纳米硅粉在烧结过程中氮化生成氮化硅纳米线，获得高纯度的氮化硅陶瓷材料。
Purification method of silicon nitride ceramic material
一种氮化硅陶瓷材料的提纯方法
CHEN JUXI (author) / ZHU FULIN (author) / LI NENG (author) / TAN QINGWEN (author) / LIU MING (author)
2023-08-25
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
| European Patent Office | 2024
| European Patent Office | 2023