There is an "oxygen inhibition layer" forming when light-curing 3D printing with radicals resin material, leading to continuous printing and surface quality improvement. Since the mechanism of controlling the structural precision of printing parts is unclear, it is thus difficult to control the precision of printing porous parts with complex shape. This paper used a self-made free radical bioceramic slurry to produce porous bioceramic scaffolds through stereolithography, investigated the three-stage curing interval in the lithography process and the principle of controlling the molding accuracy of the oxygen barrier layer. and proposed a reasonable control oxygen-inhibition layer method for adjusting the printing process parameters. It is indicated that the oxygen-inhibition layer can improve the molding accuracy of ceramic parts, and affect its mechanical properties. According to the established mechanism of the thickness of the oxygen-inhibition layer on the forming accuracy and mechanical properties of the porous structure of the bio-bone ceramic scaffold, the high-precision manufacturing basic theory and method for the multifunctional ceramic printing technique and the application of ceramic base bone substitutes were proposed.

In order to use ZrO₂ all-ceramic restorations in the dental field, ZrO₂ slurry suitable for SL technology was obtained and ZrO₂ bioceramic was prepared by SL. The mechanical properties and biocompatibility were investigated. The transformation from m-ZrO₂ to t-ZrO₂ or c-ZrO₂ in the original ZrO₂ powder was completed when sintered at different temperatures. The density of ceramic increases and the number of pores decreases as the sintering temperature increases, and the grain size increases and becomes uneven when the temperature further increases. The Vickers hardness and fracture toughness of ZrO₂ bioceramic firstly increase and then decrease when the sintering temperature increases from 1 450℃ to 1 600℃, and they reach their maximum values (i.e., 14.87 GPa and 6.73 MPa·m^1/2) at 1 500℃. The linear shrinkage and relative density are 23.42% and 97.32%, respectively. In addition, rat bone marrow mesenchymal stem cells (rBMSCs) were used for in vitro cell experiments, thus proving that ZrO₂ bioceramic fabricated by SL technique have a good biocompatibility, which can have some application prospects in dental restoration.

There is an "oxygen inhibition layer" forming when light-curing 3D printing with radicals resin material, leading to continuous printing and surface quality improvement. Since the mechanism of controlling the structural precision of printing parts is unclear, it is thus difficult to control the precision of printing porous parts with complex shape. This paper used a self-made free radical bioceramic slurry to produce porous bioceramic scaffolds through stereolithography, investigated the three-stage curing interval in the lithography process and the principle of controlling the molding accuracy of the oxygen barrier layer. and proposed a reasonable control oxygen-inhibition layer method for adjusting the printing process parameters. It is indicated that the oxygen-inhibition layer can improve the molding accuracy of ceramic parts, and affect its mechanical properties. According to the established mechanism of the thickness of the oxygen-inhibition layer on the forming accuracy and mechanical properties of the porous structure of the bio-bone ceramic scaffold, the high-precision manufacturing basic theory and method for the multifunctional ceramic printing technique and the application of ceramic base bone substitutes were proposed.

Porous alumina ceramics have many superior properties, such as high-temperature resistance, corrosion resistance, and low thermal conductivity. Alumina ceramics with solid and hollow lattices were prepared by a digital light processing (DLP) 3D printing technique. Stable alumina ceramics were sintered at 1 550℃ for 4h. The experimental results show that alumina ceramic with the solid lattice has a higher compressive strength rather than that with the hollow lattice, and the maximum compressive strength of alumina ceramic with the solid lattice is 4.80 MPa. The maximum compressive strength of the ceramic with the hollow lattice is 1.59 MPa. The results of mechanical tests are similar to the simulation data. Alumina ceramic with the hollow lattice formed by DLP technique can be used in industrial thermal insulation applications.

The nanofiber material is fabricated by electrospinning technology, which has the controllable length and high ordered structure. The nanofiber structure has unique structural advantages for applying the electrode of Solid Oxide Fuel Cell (SOFC), which can effectively improve the performance of SOFC. The nanofiber electrode has a larger specific surface area, porosity and active sites, which is conducive to the adsorption and dissociation of oxygen, and is more conducive to the rapid conduction of ions and electrons along the fiber direction, thus more effectively promoting the oxygen reduction reaction. The combination of electrospinning technology and solution impregnation technology can construct nanofiber composite electrode with controllable structure, which has excellent catalytic performance and effectively improves the performance of SOFC at medium and low temperature. In the future, it is necessary to further study the influence of polymer and external environment on the strength of nanofibers, so as to further improve the strength of nanofibers and optimize the electrode structure.

As an important part of continuous fiber reinforced ceramic matrix composite (CFRCMCs) materials, the interphase directly influences the overall performance of fabricated composite materials, hence it has always been one of the key research directions in this field. On the basis of clarifying the basic functions and requirements of an interphase, this paper reports the research progress of new interphases such as LaPO₄, Y₂Si₂O₇, CaWO₄, AlPO₄ and MAX phases that have attracted great research attention. These emerging interphases are analyzed and discussed from the perspectives of their crystal structures, thermodynamic properties, fabrication techniques and anti-oxidative effects in CFRCMCs respectively, and finally shedding some light on the future developments of new interphases for CFRCMCs.

Carbon fiber reinforced carbon and ceramic dual-matrix composites (C/C-SiC) have the characteristics of low density (≤2.5g/cm³), high-temperature resistance (to 1 600℃), good oxidation resistance, corrosion resistance, and excellent friction and wear resistance. As high-performance friction materials, C/C-SiC composites present a promising application potential in the fields of high-speed and heavy-duty equipment. Recent work on the preparation methods, microstructure design, friction and wear mechanism, modification and application of C/C-SiC friction materials were summarized, and the prospects for development of C/C-SiC composites were also proposed.

Positron emission tomography (PET) plays an important role in disease prevention and detection. In order to improve the performance of PET system, this paper reviewed the development of some scintillation crystals for PET based on the luminescence mechanism and scintillation performance. At present, cerium-doped lanthanum bromide has a superior performance in PET scintillation crystal, but it cannot replace yttrium lutetium silicate as a mainstream crystal in PET system due to the difficulty of moisture absorption and processing. Cerium-doped gadolinium gallium aluminum garnet crystal is expected to become one of the alternative materials for PET scintillation crystal due to its good time resolution and spatial resolution. The future research direction of scintillation crystals in PET field is to explore some novel crystals suitable for time-of-flight detection and depth of interaction detection technology.

A three-dimensional numerical model was proposed for double cathode solid oxide fuel cells based on the thermo-electro-mechanical-chemical multi-physics coupling theory. A novel I-type cathode flow channel with an enhanced mass transfer capability was developed. The gas flow velocity, oxygen molar fraction, pressure loss, temperature, stress distribution, and electrochemical properties of the I-type cathode flow channel and the conventional Z-type cathode flow channel were investigated. The results show that compared to the conventional Z-type flow channel, the optimized cathode flow channel has more uniform distribution of oxygen and less pressure loss in the gas flow, and the loss of concentration polarization reduces with the decrease of working voltage.

To improve the microwave absorption properties of high-temperature resistance of Si₃N₄ based composites, four kinds of composites of Si₃N₄, C_f/Si₃N₄, SiC_nf/Si₃N₄ and SiC_nf-C_f/Si₃N₄ were prepared by a gel-casting and pressure less sintering process using Si₃N₄ ceramic as a substrate, and carbon fiber (C_f), SiC nanofibers (SiC_nf) or SiC nanofibers coated carbon fiber (SiC_nf-C_f), respectively, as an absorber. A comparative study on the microstructure, dielectric properties and microwave absorbing performance at room temperature and 800℃ of as-prepared Si₃N₄ based composites was conducted. The results show that the high-temperature chemical compatibility of C_f and Si₃N₄ is effectively improved by coating SiC_nf on C_f , and C_f is well preserved in Si₃N₄ matrix and connected to each other into a conductive network, thus leading to the enhanced electron conduction and multiple relaxation phenomena in SiC_n-C_f/Si₃N₄ composite. The SiC_nf-C_f/Si₃N₄ composite exhibits the maximum dielectric loss value and the optimal microwave absorption performance both at room temperature and 800℃. At room temperature, the minimum reflection loss (RL) of SiC_nf-C_f/Si₃N₄ composite is -15.2 dB at a thickness of 2.57 mm, and the effective absorption bandwidth (RL<-10 dB) is 1.9 GHz at a thickness of 2.30 mm. At 800℃, the minimum RL reaches -20.4 dB at a thickness of 2.0 mm, and the effective absorption bandwidth increases to 3 GHz at a thickness of 2.25 mm. The main absorbing mechanism of SiC_nf-C_f/Si₃N₄ composite is multiple reflections and scattering, electrical conduction loss, electron polarization and multiple relaxations. At 800℃, the polarization and conduction of electrons are enhanced by the accelerated thermal motion of electrons, leading to a further enhancement in the microwave absorption performance. SiC_nf-C_f/Si₃N₄ composite could be used as a high-performance microwave absorbing material for microwave absorption at a high temperature.