This invention relates to a method for preparing niobium or niobium alloy filament reinforced titanium-aluminum alloy composite materials or castings. It solves the technical problems of existing casting methods where external reinforcing filaments cannot be effectively added, and solid lamination methods where molded parts cannot be directly prepared and manufacturing costs are high. Method 1: The filament is fixed in a wax injection mold using a process movable mold, then wax is injected. The resulting wax mold and gate wax rod are then combined into a centrifugal casting mold. After coating, sanding, dewaxing, and baking, a shell is obtained, which is then centrifugally cast to obtain a composite material casting. Method 2: A centrifugal casting mold, gate wax rod, and process wax block are combined. After coating, sanding, dewaxing, and baking, a shell with pre-drilled holes is obtained. The filament is secured at the end with a fixing clip to prepare a pre-formed block. This pre-formed block is placed in the mold cavity, and centrifugally cast to obtain a composite material casting. This method is suitable for preparing reinforced titanium-aluminum based alloy composite materials or composite material castings.
This invention addresses the technical problems of ineffective addition of reinforcing wires and the inability to directly fabricate molded parts using solid lamination methods when preparing filament-reinforced titanium-aluminum alloy composites via melting and casting, resulting in high manufacturing costs. A method for preparing niobium or niobium alloy filament-reinforced titanium-aluminum alloy composites or castings is provided.
The method for preparing niobium or niobium alloy filament-reinforced titanium-aluminum alloy composites or castings comprises the following steps: 1. Clamping the end of the niobium or niobium alloy filament with a process movable mold, fixing the niobium or niobium alloy filament in the cavity of the wax injection mold (3); 2. Injecting molten wax into the cavity of the wax injection mold. After the wax solidifies, open the mold, remove the process movable mold, and obtain the wax model, exposing the end of the niobium or niobium alloy filament on the outer surface of the wax model; 3. Combining the wax model prepared in step 2 with the sprue wax rod to form a centrifugal casting mold assembly; 4. Applying paint and adhesive to the centrifugal casting mold assembly. Sand is used to coat the exposed ends of niobium or niobium alloy filaments on the wax mold surface with a coating layer and a sand layer. After dewaxing and firing, a shell mold is obtained. Fifth, the shell mold obtained in step four is assembled on a centrifugal casting machine in a vacuum melting furnace. A vacuum is first created, then the power is turned on to melt the titanium-aluminum alloy. After the titanium-aluminum alloy is melted, it is poured into the shell mold through a gate. Under centrifugal force, the molten titanium-aluminum alloy is injected into the cavity of the shell mold. After the molten titanium-aluminum alloy solidifies and cools, the shell mold is removed, yielding a niobium or niobium alloy filament-reinforced titanium-aluminum alloy composite material or casting.
The preparation method of niobium or niobium alloy filament reinforced titanium-aluminum alloy composite materials or castings can also be carried out according to the following steps: 1. Inject molten wax into the mold cavity of the wax injection mold. After the wax solidifies, open the mold to prepare a wax model with the same shape as the casting; 2. Assemble the wax model, gate wax rod and process wax block prepared in step 1 into a centrifugal casting mold assembly, with the process wax block placed at the end of the wax model; 3. Apply coating and sand layer by layer to the centrifugal casting mold assembly, and then after dewaxing and firing, prepare a shell with a pre-reserved hole; 4. Secure the end of the niobium or niobium alloy filament with a fixing clip to obtain... The process involves: 1. Pre-forming the pre-formed block; 2. Placing the pre-formed block obtained in step four into the pre-drilled hole in the mold shell, plugging the hole with graphite material, and fixing the pre-formed block to obtain a ceramic mold shell; 3. Assembling the mold shell obtained in step five onto a centrifugal casting machine in a titanium-aluminum alloy vacuum melting furnace, evacuating and melting the titanium-aluminum alloy. After the titanium-aluminum alloy is melted, it is poured into the mold shell through a gate. Under centrifugal force, the molten titanium-aluminum alloy is injected into the cavity of the mold shell. After the molten liquid solidifies and cools, the mold shell is removed to obtain a niobium or niobium alloy filament-reinforced titanium-aluminum alloy composite material or casting.
This invention uses niobium or niobium alloy filaments as external reinforcement. According to design requirements, suitable niobium or niobium alloy filaments are combined with a precision-made ceramic mold shell using a process movable mold or fixed clamp. This ensures that the filaments are evenly distributed and arranged within the ceramic cavity, producing a specialized investment casting ceramic mold shell. A specialized ceramic mold is then placed on a centrifugal casting machine within a vacuum melting furnace. The molten titanium-aluminum alloy is poured into the ceramic mold, and centrifugal force forces the molten metal to flow rapidly into the ceramic cavity, filling the gaps between the filaments. This allows the molten titanium-aluminum alloy to coat the niobium or niobium alloy filaments, creating a unified composite. After the molten titanium-aluminum alloy solidifies and cools, the ceramic mold is removed, and the composite material or casting is obtained. This completes the preparation process of niobium or niobium alloy filament-reinforced titanium-aluminum alloy composite materials or castings.
Preparing titanium-aluminum alloy composite materials via melting and casting effectively incorporates niobium or niobium alloy filament reinforcements into the titanium-aluminum alloy matrix, achieving uniform distribution and good composite properties. Furthermore, this invention directly adds niobium or niobium alloy filament reinforcements during the liquid forming process of the titanium-aluminum alloy, significantly reducing manufacturing costs. It can be used to prepare not only simple-shaped composite materials but also complex molded parts, making it widely applicable.
