低温热压制备半透明α/βSi_3N_4复相陶瓷

Preparation of Translucent α/β Si_3N_4 Composite Ceramics by Low-Temperature Hot-Pressing Method

以α-Si3N4粉为原料、MgSiN2粉为烧结助剂,在1563℃热压1h制备出半透明α/βSi3N4复相陶瓷。X射线衍射分析结果表明,半透明α/βSi3N4复相陶瓷由85%(质量分数,下同)α-Si3N4和15%β-Si3N4组成。半透明α/βSi3N4复相陶瓷具有和Mg-α-SiAlON陶瓷相似的透光性质,样品厚度为0.42mm,其透过率随波长增加而增大,波长在3.3μm处透过率最大,达到66%,在2.0～4.5μm波长范围,透过率保持在50%以上,随后透过率迅速降低,在5.0μm处截止。

The translucent α-Si3N4 composite ceramics with α-Si3N4 of 85% （mass fraction, the same is below） and α-Si3N4 of 15% were prepared with α-Si3N4 as raw material and MgSiN2 as an additive by a hot-pressing method at 1563 ℃ for 1 h. The optical transmittance curve of the α-Si3N4 composite ceramics was similar to that of translucent Mg-a-SiAlON ceramic. The transmittance of the α-Si3N4 composite ceramics gradually increased with the increase of wavelength, and achieved the maximum transmittance of 66% at the wavelength of 3.3 gin. The transmittance value was 〉 50% in the wavelength range of 2.0-4.5 μm and the cut-off wave- length of the α-Si3N4 composite ceramics was located at 5.0 pan.