Laminated structure optimization and drawing performance of Al2O3–TiC/Al2O3–TiC–CaF2 self-lubricating laminated ceramic conical die

Self healing ability and strength recovery of different laminated Al2O3 cutting tool composites

“…where FO  , C  , QO  , PO2, PO2 eq and x denote the flux of oxygen, concentration of oxygen in  phase, diffusion coefficient, oxygen partial pressure in gas phase, oxygen partial pressure in equilibrium with oxide in / interface, distance along the direction of oxygen flux, respectively. K is an parameter a b calculated in term of the following law, K=KO 0 exp(-△H/(RT)) [16]. KO 0 is a constant independent of the temperature, and △H is the enthalpy of the reaction of oxygen dissolution.…”

“…Many articles emphasized on the effect of the oxide came from the additives on the self healing [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. B2O3 [1][2], ZrO2 [3][4][5][6], SiO2 [7][8][9][10][11][12] and TiO2 [13][14][15][16] were introduced into ceramic composites and have been studied as the promising self-healing systems for high temperature applications. The initial cracks are generally introduced into ceramic composites at room temperature, and the samples with cracks were put into oxygen-containing environments to observe the changing state of the cracks.…”

“…Most of the previous work mentioned from the above discussed the healing parameters such as temperature, healing time, working environment and so on. Laminated structure is one of effective strategies to enhance the flexural strength of brittle ceramics [16][17][18][19][20][21][22][23], which usually improved either because of weak interfaces or in-plane residual stresses [17][18][20][21][22][23]. However, as one of promising strategies to enhance the flexural strength of brittle ceramics, few articles were reported about the influence of laminated structure on the recovery ability of ceramic composites [24].…”

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

“…At the same time, calcium fluoride has low shear strength and thermophysical and thermochemical stability at high temperature, so it is used in high-temperature solid lubrication [10,11,12,13,14]. At present, calcium fluoride has been applied in the field of self-lubricating ceramics allowing made some advances [15,16,17,18,19,20]. Wu et al [17] prepared an Al 2 O 3 /TiC/CaF 2 multicomponent gradient self-lubricating ceramic composite by the hot-pressing method, showing that the addition of CaF 2 could improve the antifriction properties of the ceramic composite.…”

An advanced self‐lubricating ceramic composite with the addition of core‐shell structured CaF2@Al2O3 powders

“…However, this way of lubrication due to the addition of solid lubricant, reducing the mechanical properties of the tool material, shorten the tool life. CaF 2 is one of the solid lubricants, and an excellent high temperature lubricating powder . Through the powder surface coating, the uniform mixing of CaF 2 particles with different phase particles can be achieved, which can effectively improve the material properties and give it new physical, chemical and other special functions through coating …”