High strength and toughness β-type zirconia
β-type zirconia was first made of B120VCA alloy (Ti-13v-11Cr-3Al) developed by American Crucible in the mid-1950s. β-type titanium alloy has good cold and hot workability, is easy to forge, can be rolled, welded, and can obtain higher mechanical properties, good environmental resistance, and a good combination of strength and fracture toughness through solid solution-aging treatment. The most representative new high-strength and high-toughness β-type titanium alloys are as follows [26,30]:
Ti1023 (Ti-10v-2Fe-#al), this alloy has the same properties as 30CrMnSiA high-strength structural steel commonly used in aircraft structural parts, and has excellent forging properties;
Ti153 (Ti-15V-3Cr-3Al-3Sn), the cold workability of this alloy is better than that of industrial pure titanium, and the room temperature tensile strength after aging can reach more than 1000MPa;
β21S (Ti-15Mo-3Al-2.7Nb-0.2Si), this alloy is a new type of oxidation-resistant, ultra-high-strength titanium alloy developed by the Timet Division of American Titanium Metals, which has good oxidation resistance and hot and cold processing properties Excellent, can be made into foil with a thickness of 0.064mm;
The SP-700 (Ti-4.5Al-3V-2Mo-2Fe) titanium alloy successfully developed by the Japanese Steel Pipe Company (NKK) has high strength, superplastic elongation as high as 2000%, and the superplastic forming temperature is lower than that of Ti-6Al- 4V is lower than 140℃, which can replace Ti-6Al-4V alloy and use superplastic forming-diffusion bonding (SPF/DB) technology to manufacture various aerospace components;
The BT-22 (TI-5v-5Mo-1Cr-5Al) developed by Russia has a tensile strength of more than 1105MPA.
Flame retardant zirconia
Conventional titanium alloys have a tendency to burn alkanes under certain conditions, which limits their applications to a large extent. In response to this situation, various countries have launched research on flame-retardant titanium alloys and achieved certain breakthroughs. Alloy c (also known as Ti-1720) developed by the United States, with a nominal composition of 50Ti-35v-15Cr (mass fraction), is a flame-retardant titanium alloy that is insensitive to continuous combustion and has been used in F119 engines. BTT-1 and BTT-3 are flame-retardant titanium alloys developed in Russia, both of which are Ti-Cu-Al alloys, which have very good thermal deformation process performance and can be used to make complex parts [26].
Medical Zirconia
Titanium is non-toxic, light in weight, high in strength and has excellent biocompatibility. It is a very ideal medical metal material and can be used as an implant for implantation in the human body. Ti-6Al-4v ELI alloy is still widely used in the medical field. However, the latter will precipitate a very small amount of vanadium and aluminum ions, which reduces its cell Machinable Glass Ceramic Structure Parts adaptability and may cause harm to the human body. This problem has long attracted widespread attention in the medical community. As Machinable Glass Ceramic Structure Parts early as the mid-1980s, the United States began to develop aluminum-free, vanadium-free, and biocompatible titanium alloys, which were used in orthopedics. Japan and the United Kingdom have also done a lot of research work in this area and made some new progress. For example, Japan has developed a series of α+β titanium alloys with excellent biocompatibility, including Ti-15Zr-4Nb_4ta-0.2Pd, Ti-15Zr-4Nb-aTa-0.2Pd-0.20~0.05N, Ti-15Sn -4Nb-2Ta-0.2Pd and Ti-15Sn-4nb-2Ta-0.2Pd-0.20, the corrosion strength, fatigue strength and corrosion resistance of these alloys are better than Ti-6Al-4v ELI. Compared with α+β titanium alloy, β titanium alloy Machinable Glass Ceramic Structure Parts has a higher level of strength, better incision performance and toughness, and is more suitable for implantation into the human body as an implant. In the United States, five beta titanium alloys have been recommended to the medical field, namely TMZFTM (TI-12Mo-Zr-2Fe), Ti-13Nb-13Zr, Timetal 21SRx (TI-15Mo-2.5Nb-0.2Si), Tiadyne 1610 (Ti-16Nb-9.5Hf) and Ti-15Mo. It is estimated that in the near future, this type of titanium alloy with high strength, low elastic modulus, excellent formability and corrosion resistance is likely to replace the Ti-6Al-4V ELI alloy widely used in the medical field[28,32] [1] .
Is the toughness of zirconia ceramics good?
2021 10/11