A ceramic hollow ball/titanium-based composite foam material and its centrifugal casting method

Abstract

The present invention proposes a centrifugal casting method of ceramic hollow sphere / titanium-based composite foam material through simple improvement on the basis of the existing casting equipment and technology of titanium metal. Add ceramic hollow balls into the mold and a filter screen used to fix the ceramic hollow balls in the corresponding cavity of the casting product to prevent the ceramic hollow balls from entering the pouring system, and then install the ceramic hollow balls and the filter screen. After preheating, use the tooling to fix it on the centrifugal disc, put it into the vacuum furnace to vacuumize, start the centrifugal equipment, and then pour the titanium or titanium alloy metal liquid. The composite foam material has both the light weight, high specific strength, high anti-corrosion performance of titanium metal and the light weight, energy absorption, sound insulation, shock absorption, electromagnetic shielding function of porous metal, and low density. The balls are evenly distributed.

Description

technical field [0001] The invention belongs to the field of metal foam manufacturing, and in particular relates to a ceramic hollow ball / titanium-based composite foam material and a centrifugal casting method thereof. Background technique [0002] Foam metal materials have excellent characteristics such as low density, energy absorption and shock absorption, and sound insulation and sound absorption. They have always been a hot direction in the development and application of new materials at home and abroad. Implanting ceramic hollow spheres into a metal matrix can produce ceramic sphere / metal matrix composites, which is a new direction for the preparation of foamed metals. Compared with traditional metal foam, ceramic ball / metal matrix composites have a higher relative density and improved mechanical properties, and can be used in the manufacture of aircraft carrier flight decks, lightweight quick-loading bridges, anti-mine floor plates for military vehicles, bulletproof c...

AI Technical Summary

Problems solved by technology

This method is used to produce porous titanium has the following disadvantages: the melting and casting process of titanium is all vacuum state and directly carries out gravity casting. This method can not be realized by increasing the infiltration speed of metal liquid to the cavity through the negative pressure environment of the cavity, resulting in The impregnation depth is not high, or even impenetrable, and the pouring environment and equipment mentioned in this method are quite different from those currently used for casting titanium metal

The preparation of porous titanium by this method has the following problems: under the condition that the relative density of the ceramic ball is close to that of the molten metal, it can be prepared by stirring, but the goal of light weight cannot be achieved. If the density of the ceramic ball is low, the ceramic ball will float in the molten metal. There is no corresponding solution in the patent

The metal matrix hollow sphere composite material prepared by this method has poor uniformity and high density due to various factors such as buoyancy and stirring, and it is difficult to prepare a light and uniform metal matrix composite material.

[0007] The invention patent with the notification number CN104588617B proposes a method for preparing metal-based lightweight composite materials in one step. The patent uses hollow balls to be poured into the mold for preheating. Ceramic balls account for 2 / 3 of the volume of the mold. The method of pouring the upper part and pumping air at the lower part has the following disadvantages when used in the manufacture of porous titanium: slow preheating of hollow spheres, long vacuuming time, slow infiltration speed, low production efficiency, and the volume fraction of hollow spheres in the prepared composite material Low, high material density, not suitable for engineering promotion and application

[0011] In summary, the existing ceramic ball / metal matrix composite material preparation technology cannot prepare low-density and uniformly distributed ceramic hollow ball / titanium-based composite foam material, which has poor seepage effect, fragile ceramic balls, and high density. , Difficulty in operation, difficulty in industrialization promotion, inability to effectively fix ceramic hollow balls, etc.

Moreover, the existing casting methods of metal titanium and titanium alloy mainly include vacuum gravity casting and vacuum centrifugal casting, which are quite different from the casting methods mentioned in the existing ceramic ball / metal matrix composite material preparation technology, that is, they cannot be used in the present Some cast titanium production equipment and processes are improved to manufacture low-density ceramic hollow balls / titanium-based composite foam materials

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