The perfect combination of lightweight and high performance of titanium alloy fasteners
The application advantages of titanium alloy materials in the field of fasteners are significant, which not only meets the high requirements for material performance in high-end fields such as aerospace, but also provides new possibilities for the lightweight and high performance of fasteners. With the development of China's aerospace industry, the level of connection technology used by new aircraft and space vehicles continues to improve, and new requirements for new fasteners are also put forward. Ultra-high strength titanium alloy fasteners are one of the trends of future development.
The application of titanium alloy material in fasteners has the following advantages:
(1) Low density. The density of titanium alloy is significantly less than the density of steel material, so titanium alloy fasteners are lighter than steel fastener materials.
(2) High specific strength. Titanium alloy is a Metal Material with high specific strength among common metal materials. Using the advantages of high specific strength, titanium alloy can also be used to replace the lighter weight aluminum alloy material, when the applied load is the same, titanium alloy parts of the geometric size is smaller, can effectively save space, this material utilization concept is of great significance to the aerospace field.
(3) High melting point. The melting point of titanium alloy is significantly higher than that of steel material, so the heat resistance of titanium alloy fasteners is better than that of steel fasteners.
(4) The coefficient of thermal expansion and elastic modulus are small. The thermal expansion coefficient and elastic modulus of titanium alloy material are smaller than that of nickel alloy and steel material, and the thermal stress generated by titanium alloy is very small in the same temperature range, so titanium alloy has higher thermal fatigue performance.
(5) No magnetic. The permeability of titanium alloy is very small and almost negligible, so titanium alloy fasteners are non-magnetic and can effectively prevent magnetic field interference. Austenitic stainless steel is also non-magnetic, but the subsequent cold processing will increase its magnetism, and the hot or cold processing of titanium alloy does not change its magnetism, which makes titanium alloy can be applied in avionics equipment.
(6) High yield ratio. The critical strength standard for the design of fasteners under tensile load is the yield strength, followed by the tensile strength, because once the fastener produces yield deformation, it will lose its fastening effect. Compared with iron and steel materials, the yield strength of titanium alloy is close to the tensile strength, and the bending strength ratio is high, so the safety of titanium alloy fasteners is high.
(7) The electrode potential is matched with the carbon fiber composite material. In the fasteners, the important reason for the huge amount of titanium alloy is that the electrode potential of titanium alloy matches the electrode potential of carbon fiber composite material, which effectively prevents the occurrence of galvanic corrosion.
(8) In addition, titanium alloy also has excellent corrosion resistance, high creep resistance and other advantages.
With its excellent performance and wide application prospects, titanium alloy fasteners are gradually becoming the outstanding choice of future connection technology. With the continuous progress of technology and the continuous expansion of applications, titanium alloy fasteners will show their unique advantages and value in more fields.
