Titanium additive

Abstract

The invention discloses a titanium additive which comprises a titanium powder and a fluxing agent. The titanium powder and the fluxing agent are mixed in a proportion and quantitatively pressed into the titanium additive, wherein the titanium additive is in aluminium foil packing; the titanium powder is a high-pure titanium powder which is prepared by carrying out magnetic separation on waste titanium so as to remove chlorine-magnesium impurities and has the fineness above 80-mesh; and the fluxing agent is an environment-friendly fluxing agent which is prepared from aluminum powders and vaseline and has fineness of 80-100 meshes. The fineness of the titanium additive is small; the melting amount is improved at the low temperature of 730 DEG C at the melting rate of below 5 minutes, thereby shortening melting time and improving the actual recovery rate of the titanium additive, wherein the recovery rate can reach above 95%; when the grain refining agent is used in melting, no environment pollution happens; manufacturing cost can be reduced by above 20% by utilizing waste titanium; comprehensive mechanical property of aluminum alloy can be improved; fissure and shrinkage porosity tendencies of the aluminum alloy product are reduced; and the quality of the aluminum alloy product is improved.

Description

technical field [0001] The invention relates to a flux for aluminum alloy processing, in particular to a titanium element additive. Background technique [0002] Titanium is the most commonly used grain refiner in aluminum alloys. It can refine the structure, improve the mechanical properties of aluminum alloy castings, increase the density of castings, and reduce shrinkage and cracks in castings. At present, domestic titanium element additives are processed by mixing titanium powder and flux, among which the flux is halide salts, such as potassium fluoroaluminate, sodium fluoroaluminate, etc. The existing titanium element additives have the following problems in use : First, the melting is slow and the melting time is long in the aluminum alloy smelting process; the second is that the melting amount in 730 °C low-temperature aluminum water is relatively small, and the recovery rate (melting rate) is low, generally only 90-92%; the third is flux Melting and packaging combus...

AI Technical Summary

Problems solved by technology

At present, domestic titanium element additives are processed by mixing titanium powder and flux, among which the flux is halide salts, such as potassium fluoroaluminate, sodium fluoroaluminate, etc. The existing titanium element additives have the following problems in use : First, the melting is slow and the melting time is long in the aluminum alloy smelting process; the second is that the melting amount in 730 °C low-temperature aluminum water is relatively small, and the recovery rate (melting rate) is low, generally only 90-92%; the third is flux Melting, packaging and burning will produce harmful gases and pollute the environment; then use titanium powder as a titanium element additive for direct processing, which is costly

The main reasons for the above problems are as follows: First, the melting point of titanium element in the titanium element additive is 1668 ° C, the melting point is high, and the particle size is too large, the melting is slow, the time is long, and the melting heat absorption is large, resulting in slow melting of titanium element. When aluminum water When the temperature is 730°C, the melting amount of the titanium element additive decreases, and the melting rate of the titanium element that actually melts in the aluminum water is only 90-92% (the recovery rate refers to the proportion of the titanium element that has been melted in the aluminum water to the titanium element additive The percentage of the total titanium element in the medium), and a part of the unmelted titanium element is left in the treatment slag and wasted; the second is that the flux contains harmful substances such as fluorine, and the titanium element additive is packaged in plastic, and the flux is melted and plastic Combustion will produce harmful gases containing fluorine, which will cause serious pollution to the environment; and then directly use titanium powder for processing, the price of titanium powder is high, and the melting rate is low, and the waste titanium in the waste residue has not been recycled yet.