Zhengzhou Qingyan Alloy R & D Aviation Aluminum Lithium Alloy Chassis Shell

A few days ago, the aluminum-lithium alloy chassis shell developed by Zhengzhou Qingyan Alloy Technology Co., Ltd. was successfully delivered. This case shell is applied to a domestic fighter model . It is made of aluminum-lithium alloy forgings by CNC machining and surface anti-corrosion treatment . Compared with the original aluminum alloy shell, the weight is reduced by 11% . On the basis, it achieves the " immediate effect " weight loss effect.

At present, the urgency of aviation and aerospace vehicles for weight loss has entered the era of "grams of care" . Aircraft designers have worked hard to reduce weight, from structural design weight loss to raw material replacement weight loss. Weight loss has become an "eternal" goal in the development of aircraft. As a light-weight, high-strength metal structural material , aluminum-lithium alloy has very broad application prospects in the aviation and aerospace fields . For every 1% of lithium added to the alloy , the density is reduced by 3% and the elastic modulus is increased by 6% . Lithium aluminum alloy instead of the conventional high strength aluminum alloy structure which allows weight reduction of 5% to 15%, the stiffness increased by 15% to 20%, while the aluminum-lithium alloy has strong corrosion resistance, by GJB96h, 192h acid salt spray test . Replacing the original aluminum alloy with lightweight high-strength aluminum-lithium alloy for weight reduction under the condition of ensuring the original operating load will effectively reduce the structural weight of the aircraft, improve the effective number of bombs and mobility of the strategic aircraft, and meet its ultra-high altitude , Ultra-high speed, high precision and multi-functional development requirements, and then meet the strategic needs of modern warfare for weapons and equipment . According to reports, some aircrafts at home and abroad use magnesium alloys that have a weight advantage over aluminum alloys to achieve weight loss, but the fatal " corrosion " and " flammable " defects of magnesium alloys hinder their application in aircrafts. It cannot meet all-weather and all-regional strategic operations requirements of modern warfare aircraft .

Because the lithium element is very active, smelting aluminum-lithium alloys under atmospheric conditions is prone to slagging and hydrogen absorption, which seriously affects the performance and quality of the alloy. At present, there are three methods in the world that can produce aluminum-lithium alloys: ( 1 ) vacuum melting casting method; ( 2 ) gas shielding melting + negative pressure hydrogen extraction static + semi-continuous casting method; ( 3 ) gas shielding melting + spray deposition casting method . For this reason research establishment Zhengzhou Light Alloy Technology Co., Ltd. R & D and the Al-Li alloy developed by the national internet vacuum casting way to solve easily absorbing the aluminum-lithium alloy, oxide slag, segregation, shrinkage and other problems and easy, have developed Aluminium-lithium alloys such as 1420 and 2195 are available. Plates, foils, tube-type wires, forgings and other products can be provided in batches, and parts can be provided according to customer drawings. At the same time, for the pre-research model of aluminum-lithium alloy, the company has the full process development capability from design drawings to parts delivery (fusion casting, machining and forming, heat treatment, machining, surface treatment, inspection) .