Titanium Composite High-Strength material

[Anders Hoveland]

I had an idea. Could titanium alloy be reinforced with a high tensile strength fiber?

 

Lower melting point titanium alloys:

" Ti15Cu15Ni and the newly developed Ti21Ni14Cu.

Zr-Ti-rich side of the Zr-Ti-Ni(Cu) alloy system were investigated for brazing of titanium alloys. Low-melting ternary and quaternary eutectic alloys with melting temperatures below 800°C were discovered. Using eutectic as well as off-eutectic braze alloys, CP-Ti and Ti-6Al-4V alloys were successfully brazed at 830°C and 850°C."

 

These alloys show comparable strength to normal high-melting point titanium alloys.

 

"Aluminum nitride is one of the few materials that is both a good thermal conductor and a good electrical insulator. It is also a high-temperature ceramic, that has a low thermal expansion coefficient, and low dielectric constant. It is also stable to molten metals such as aluminum, has good wear resistance, and good thermal shock resistance.

Various preceramic oligomer and polymer routes to aluminum nitride have been investigated. For example, the reaction of LiAlH4 or AlH3 with ammonia initially yields Al(NH2)3, which loses ammonia and hydrogen during pyrolysis and leaves AlN contaminated by carbon from the initial reaction solvent.

Fibers of aluminum nitride have been produced by the melt-spinning of ethyl-alazanes derived from the reactions of triethylaluminum and ammonia. The spinnable products have compositions such as [(EtAlNH)x(Et2AlNH2)y(Et3Al)z]n which probably consist of linked alazane rings and chain structures. Pyrolysis in ammonia gives aluminum nitride fibers.

Interrante and coworkers reported techniques for the preparation of alloys of SiC and AlN by the copyrolysis of precursors to both silicon carbide and aluminum nitride. The source of the aluminum component was commercially available aluminum alkyls [such a trimethylaluminum] which, when treated with ammonia, initially give cyclic alazanes such as (CH3AlNH2)x, and cross-linked species CH3AlNH by pyrolytic loss of CH4. Further pyrolysis gives a high purity, oxygen- and carbon-free AlN in nearly quantitative yield. … Copyrolysis took place initially at 170 °C , but later at temperatures up to 350 °C under nitrogen, and then up to 2,000 °C to give a homogeneous Si/C/AlN ceramic."

"Inorganic Polymers", James E. Mark, H. R. Allcock, Robert West, p330

 

 

"A process for synthesizing aluminium nitride fibres includes such technological steps as mixing microcrystalline aluminium silicate fibres in sillimanite structure with carbon black or graphite, heating to 1500-1750 deg.C in nitrogen atmosphere, keeping the temp for a certain time, and exhausting residual carbon at 550-650 deg.C, and features no strict requirement to purity and Al/Si ratio of raw material, simple process, good operation and repeatability, high output rate of AlN fibres up to 100% and low cost."

Chinese Patent 98103408, year 1998