CN102921928A - Method for producing titanium or titanium alloy castings by using titanium sponges - Google Patents

Abstract

The invention provides a method for producing titanium or titanium alloy castings with titanium sponge. The method for producing titanium or titanium alloy castings with titanium sponge comprises the following steps: selecting the titanium sponge; batching and briquetting the titanium sponge; melting the mixture of the briquette in a smelting and pouring furnace; pouring the melted mixture into Casting molds to produce titanium or titanium alloy castings. The titanium and titanium alloy castings produced by the method of the present invention have good corrosion resistance, low density, high strength, etc. Compared with the traditional method of producing titanium and titanium alloys with sponge titanium, the quality and cost are obviously optimized.

Description

A method of producing titanium or titanium alloy castings with sponge titanium

technical field

The invention belongs to the production field of titanium and titanium alloy castings, and in particular relates to a method for producing titanium or titanium alloy castings with sponge titanium.

Background technique

Titanium and titanium alloys have been widely used in various industries due to their excellent properties such as good corrosion resistance, high strength and low density. Usually, titanium and titanium alloy castings are mostly pressed by sponge titanium and vacuum welded into electrodes. After melting and casting one ingot or multiple ingots, they enter the vacuum consumable electrode arc solidification furnace for production. However, the cost of spongy titanium melting and casting is expensive, so to a certain extent, the cost and price of titanium and titanium alloy castings are high. In addition, the technology of using bulk or electrode-like sponge titanium to produce titanium and titanium alloy castings has also been proposed. In this technology, the bulk or electrode-like sponge titanium is first put into the cooling bed furnace for titanium ingot casting, and then made to Enter or directly enter the solidification furnace for the production of titanium and titanium alloy castings; however, this technology will cause problems such as low casting efficiency, unstable composition, high cost, and high price, and will cause the use of titanium and titanium alloy castings The cost is high, which is not conducive to popularization and application.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention provides a method for producing titanium or titanium alloys with good corrosion resistance, low density and high strength by using titanium sponge.

The invention provides a method for producing titanium or titanium alloy castings by using sponge titanium. The method comprises the following steps: selecting the sponge titanium; batching and briquetting the sponge titanium; mixing the briquette in a smelting and pouring furnace The material is melted; the molten mixture is poured into the mold to produce titanium or titanium alloy castings.

According to the present invention, the added amount of titanium sponge can be 0.01%-100% of the total weight of raw materials.

According to the present invention, in the step of briquetting or melting the titanium sponge, the required supplementary alloy can be added to the titanium sponge as required.

According to the present invention, one or more briquettes can be mixed, and one or more briquettes can be added to the melting and pouring furnace.

According to the present invention, the smelting and pouring furnace can be a vacuum water-cooled copper crucible induction shell furnace, a vacuum non-consumable electrode arc shell furnace, an electron beam shell furnace, a plasma beam shell furnace, and a vacuum electroslag shell furnace. one or both.

According to the present invention, the casting mold can be one of investment casting mold, graphite casting mold, tamping casting mold and disappearing casting mold.

According to the present invention, the method may further include the operation of performing at least one post-treatment of cleaning, flaw detection, hot isostatic pressing, heat treatment and machining on the titanium or titanium alloy casting.

The titanium and titanium alloy castings produced by the method of the invention have good corrosion resistance, low density, high strength, etc. Compared with the traditional method of producing titanium and titanium alloys with sponge titanium, the quality and cost are obviously optimized.

Detailed ways

The invention provides a method for producing titanium or titanium alloy castings with sponge titanium. The titanium and titanium alloy castings produced by the method of the invention have good corrosion resistance, low density, high strength, etc., and are different from those produced with sponge titanium. Compared with titanium and titanium alloy casting methods, both quality and cost are significantly optimized.

Specifically, the present invention provides a method for producing titanium or titanium alloy castings with titanium sponge, the method comprising the following steps performed in sequence: selecting the titanium sponge; batching and briquetting the titanium sponge; The mixture of compacts is melted; the molten mixture is poured into molds to produce titanium or titanium alloy castings.

According to the present invention, different grades of titanium sponge are selected according to different incoming materials, and the titanium sponge is selected to remove impurities. Here, methods commonly used in the art can be used to select the titanium sponge, so details will not be repeated here. In addition, different grades of titanium sponge are products provided by titanium sponge manufacturers, and grades can be classified according to products.

According to the present invention, when producing pure titanium castings, all the selected sponge titanium is added for batching and briquetting. At this time, the mixture obtained by the sponge titanium batching is actually only sponge titanium; in the case of producing titanium alloy castings , using sponge titanium and required alloys as raw materials, wherein, according to actual needs, the amount of sponge titanium added can be 0.01% to 100% of the total weight of the raw materials. Then, the mixed material briquette is divided into one or more to realize mixed material briquettes with different weights, and then the mixed material after one or more briquetted materials is added into the shell curing furnace.

In the case of producing titanium alloy castings, the alloy can be added to the selected sponge titanium at different times. According to an embodiment of the present invention, the titanium sponge of the required weight (expected amount) can be weighed according to needs, and then the titanium sponge of the predetermined weight is compacted and melted, wherein, the titanium sponge can be compacted or melted In the step of adding the desired weight (desired amount) of the alloy to the titanium sponge. According to another embodiment of the present invention, the required weight (expected amount) of the alloy can be added to the titanium sponge when the titanium sponge is batched. According to another embodiment of the present invention, when the sponge titanium is batched, a part of the alloy of the required weight can be added to the sponge titanium, and then when the mixture of the melting compact is mixed, the remaining amount of the alloy of the required weight can be added. Partially added to the mixture. Therefore, according to the present invention, the timing of adding the alloy can be selected according to the actual situation.

According to the present invention, the smelting and pouring furnace used to melt the mixture of briquettes can be a vacuum water-cooled copper crucible induction shell solidification furnace, a vacuum non-consumable electrode arc shell solidification furnace, an electron beam shell solidification furnace, or a plasma beam shell solidification furnace One or two of the vacuum electroslag solidification furnace can be used for one or more pouring according to the actual situation.

According to the present invention, the casting mold can be one or more of investment precision casting mold, graphite casting mold, tamping casting mold and lost model.

In addition, according to the present invention, after the titanium or titanium alloy casting is produced, at least one post-processing operation of cleaning, flaw detection, hot isostatic pressing, heat treatment, machining, etc. may be performed on the titanium or titanium alloy casting.

The method for producing titanium castings or titanium alloy castings using titanium sponge according to the present invention will be described in detail below in conjunction with specific examples.

Example 1

Manufacture pure titanium castings of TA2 grade. Using 0-grade sponge titanium as raw material, the sponge titanium is selected to remove sundries. Next, the 100% titanium sponge is compacted into a block. Then, use a vacuum water-cooled copper crucible induction shell furnace to melt the briquetted titanium sponge, and pour it into an investment precision casting mold after melting to obtain a titanium casting. Finally, follow-up treatments such as cleaning, hot isostatic pressing, heat treatment, and machining are carried out on the titanium casting.

Example 2

Manufacture titanium alloy castings of TC4 grade. Using grade 1 sponge titanium as raw material, the sponge titanium is selected to remove sundries. Then, batching is carried out according to the requirements of the TC4 grade, and 50% of the required alloy material is mixed with sponge titanium for batching, and then the mixture is compacted into three blocks. Then, use a vacuum non-consumable electrode arc shell solidification furnace to melt the mixed material of the briquette, add the remaining alloy that needs to be supplemented at the later stage of melting, and pour it into a graphite mold after melting to obtain a titanium alloy casting. Finally, follow-up treatments such as cleaning, hot isostatic pressing, heat treatment, and machining are carried out on the titanium alloy castings.

Example 3

Manufacture titanium alloy castings of TB32 grade. Using grade 1 and grade 2 titanium sponge as raw materials, the titanium sponge is selected to remove impurities. Then, batching is carried out according to the requirements of the TB32 brand, and then the mixed material is compacted into eleven blocks, wherein the required supplementary alloy is added during the compaction. Then, the mixture of the briquette is melted by using an electron beam solidification furnace, and poured into a compacted mold after melting to obtain a titanium alloy casting. Finally, follow-up treatments such as cleaning, hot isostatic pressing, heat treatment, and machining are carried out on the titanium alloy castings.

Comparative example 1

Use grade 1 sponge titanium as raw material to select sponge titanium. Then, according to the requirements of TC4 brand, the required alloy material is packed with aluminum foil and pressed together with sponge titanium to form a block or mixed with sponge titanium to press the block, and then the compacted block is vacuum argon arc welding The box is welded into a primary electrode. Then, the primary electrode is melted one or more times in a vacuum consumable electrode electric arc furnace to obtain one or more ingots. After one or more ingots are processed, they are melted in a vacuum consumable electrode arc shell solidification furnace, and then poured into graphite molds to obtain titanium alloy castings. Finally, follow-up treatments such as cleaning, hot isostatic pressing, heat treatment, and machining are carried out on the titanium alloy castings.

Therefore, the titanium and titanium alloy castings produced by the method of the present invention have properties such as good corrosion resistance, low density, and high strength. Compared with the traditional method of producing titanium and titanium alloys with sponge titanium, the quality and cost are significantly improved. optimization.

The present invention is not limited to the above-described embodiments, and various variations and modifications can be made to the embodiments of the present invention without departing from the spirit and scope of the present invention.

Claims (7)

1. A method for producing titanium or titanium alloy castings with titanium sponge, characterized in that said method may further comprise the steps: Selection of sponge titanium; Batching and briquetting the sponge titanium; Melting the mixture of briquettes in a smelting and pouring furnace; The molten mixture is poured into molds to produce titanium or titanium alloy castings. 2. The method according to claim 1, characterized in that the amount of titanium sponge added is 0.01% to 100% of the total weight of raw materials. 3. The method according to claim 1, characterized in that in the step of briquetting or melting the titanium sponge, adding alloys to be supplemented as needed into the titanium sponge. 4. The method according to claim 1, characterized in that 1 or more briquettes are added to the smelting and pouring furnace, and 1 or more briquettes are added. 5. The method according to claim 1, wherein the smelting and pouring furnace is a vacuum water-cooled copper crucible induction shell solidification furnace, a vacuum non-consumable electrode arc shell solidification furnace, an electron beam shell solidification furnace, or a plasma beam solidification shell One or both of the furnace and the vacuum electroslag solidification furnace. 6. The method according to claim 1, wherein the casting mold is one of investment casting mold, graphite casting mold, tamping casting mold and disappearing casting mold. 7. The method according to claim 1, characterized in that the method further comprises the operation of performing at least one subsequent treatment of cleaning, flaw detection, hot isostatic pressing, heat treatment and machining on the titanium or titanium alloy casting.