Interfacial reactions in K₂Ti₆O_13(w)/Al₂O₃/Al composite

Abstract

A pure Al matrix composite, reinforced by potassium titanate whiskers coated with sol -gel alumina, was fabricated by squeeze casting. Good interface bonding was achieved in the coated composite. Interfacial reactions in the composite were found to be less severe than those in an uncoated composite, owing to the barrier effect of sol -gel a-Al 2 O 3 coating. After the composite was thermally exposed at 530 ‡C for 30 h, the alumina coating still restrained the decomposition of the whisker structure, and thus prevented a decrease in the strength of the composite. However, after a thermal exposure at 700 ‡C for 10 h, the coating was no longer held on whisker surfaces. Mechanical testing showed that tensile fracturing of the coated composite tended to occur at the coating/matrix interface where the interfacial bonding is weaker than at the coating/whisker interface.MST/4717

Crystalline Structure, Synthesis, Properties and Applications of Potassium Hexatitanate: A Review

“…In this sense, is interesting to mention that PHT fibers have been used to reinforcing polymers, ceramics and metal alloys to obtain composites, which have a wide application (in automotive, money paper, refractories, etc.) because of their price, which is lower than other reinforcing agents such as silicon carbide, silicon nitride, aluminum borate, among others [23,[65][66][67].…”

“…PHT also has been used to reinforce alloys, principally light aluminum and magnesium alloys [65]; in this area, several research works can be cited in which PHT fibers/whiskers have increased mechanical and wear resistance and diminished the coefficient of friction and thermal expansion of the composites [23,66,67,[78][79][80]. Likewise, PHT fibers/whiskers are effective for the prevention of fading because of their high heat resistance.…”

In vitro bioactivity assessment and mechanical properties of novel calcium titanate/borosilicate glass composites

“…Particles of K 2 Ti 4 O 9 and K 2 Ti 6 O 13 have demonstrated to possess high mechanical properties (an elasticity modulus close to that of the theoretical value, tensile strength about of 6 GPa [16]) and are very attractive as a reinforcement for different types of matrix materials [17]. In addition, it was shown in our previous research publication [18] that crystallization of the potassium polytitanate was accompanied with a formation of meso-porous structure which could be attractive for bone tissue regeneration.…”

Synthesis of potassium polytitanate precursors by treatment of TiO2 with molten mixtures of KNO3 and KOH

“…This type of materials is an alternative to silicon carbide, taking into account its lower price. [1][2][3][4][5][6] On the other hand, potassium titanate powders could be used to produce ceramics characterized with high mechanical properties and thermal resistance. However, the production of such powders (for example, K 3 Ti 9 O 13 , K 2 Ti 6 O 13 ) is based on multistage methods that involve sintering at high temperatures (1000 • C).…”