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Method for manufacturing titanium and titanium alloy and part thereof by taking hydrogenated sponge titanium as raw material

A technology of sponge titanium and raw materials, applied in the field of manufacturing powder metallurgy titanium and titanium alloys and their parts, can solve the problems of insufficient room temperature elongation, high oxygen content, long production cycle, etc., and achieve short-process manufacturing and powder quality. High, low cost effect

Inactive Publication Date: 2018-03-06
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for preparing titanium and titanium alloy materials using hydrogenated sponge titanium as raw material and synchronously manufacturing parts, so as to solve the problem of high oxygen content, low density and insufficient room temperature elongation of current powder metallurgy titanium alloys. , Coarse grains, long production cycle and high cost, etc., to realize the rapid preparation and molding of low-cost and low-oxygen powder metallurgy titanium and titanium alloys

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  • Method for manufacturing titanium and titanium alloy and part thereof by taking hydrogenated sponge titanium as raw material
  • Method for manufacturing titanium and titanium alloy and part thereof by taking hydrogenated sponge titanium as raw material
  • Method for manufacturing titanium and titanium alloy and part thereof by taking hydrogenated sponge titanium as raw material

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Embodiment 1

[0042] The concrete technological process of the present embodiment is:

[0043] ①Hydrogenation of sponge titanium: In a hydrogenation furnace, keep titanium sponge with a particle size of less than 30mm at 450°C and a hydrogen pressure of 1.0 to 1.2atm for 2 hours to prepare hydrogenated titanium sponge (with a hydrogen content of 4.3wt.%) );

[0044] ② Synchronous mechanical ball milling to prepare titanium hydride powder: Under the protection of argon, put the hydrogenated sponge titanium raw material into the ball mill tank of a planetary ball mill or agitator ball mill, and perform mechanical ball milling simultaneously to prepare titanium hydride powder. Among them, under the conditions of ball-to-material mass ratio of 2.5:1 and ball mill speed of 300rpm, titanium hydride powder with a particle size of less than 25 μm can be prepared by ball milling for 30 minutes, and titanium hydride powder with a particle size of less than 15 μm can be prepared by ball milling for 1 ...

Embodiment 2

[0052] The concrete technological process of the present embodiment is:

[0053] ①Hydrogenation of sponge titanium: In a hydrogenation furnace, keep zero-grade sponge titanium at 450°C and 1.0-1.2atm hydrogen pressure for 2 hours to prepare hydrogenated titanium sponge (hydrogen content: 4.3wt.%);

[0054] ② Synchronous mechanical ball milling to prepare alloy mixed powder: according to the mass ratio of TC4 titanium alloy Ti-6Al-4V, hydrogenated sponge titanium and brittle AlV40 intermediate alloy particles are put into the ball milling tank of the stirring ball mill together, under the protection of argon The mixed powder of titanium hydride and AlV40 was prepared by synchronous mechanical ball milling and homogenization. Among them, the mass ratio of the ball to the material is 2.4:1, the speed of the ball mill is 300rpm, and the ball mill is 2h. The particle size of the prepared mixed powder is less than 15 μm, and the average particle size is less than 4 μm; no sieving an...

Embodiment 3

[0062] The difference between this embodiment and embodiment 2 lies in the process steps ③~⑦.

[0063] The powder compact in the process step ③ is to take the powder mixture prepared by mechanical ball milling, put it into the mold cavity of the engine connecting rod part, and hold the pressure for 2 minutes under the pressure of the 950MPa hydraulic press to complete the compaction. The profile size of the control engine connecting rod powder blank is about 12% larger than the actual part size. This actually takes into account the volume shrinkage of the green compact of about 8% due to hydrogen release during the induction heating process and the subsequent machining allowance of about 4%.

[0064] Rapid sintering and simultaneous partial dehydrogenation of powder compacts in process step ④: heating the powder compacts of connecting rods at a rate of 80°C / min to 1250° C. and holding for 2 minutes; during the sintering process, the hydrogen content in the powder blank was re...

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Abstract

The invention belongs to the technical field of preparing and processing of titanium and a titanium alloy, and particularly relates to a method for manufacturing titanium and titanium alloy and part thereof by taking hydrogenated sponge titanium as a raw material. The method comprises the following steps: hydrogenating sponge titanium; synchronously ball-milling to prepare hydrogenated titanium powder or mixed powder; pressing the powder; quickly sintering and synchronously dehydrogenizing; thermally mechanically solidifying or forming; performing complete vacuum dehydrogenizing; and obtainingan alloy product. The method realizes synchronously ball-milling to prepare mixed powder from hydrogenated sponge titanium and alloying raw materials, and the powder does not need to screen, so thatthe powder yield is greater than 96%; and under protection of inert atmosphere, pressing, quick heating and alloying, thermal mechanical solidifying and forming are completed. The method is short in process flow, is high in efficiency, can prepare the titanium and the titanium product with high compaction (greater than or equal to 99.8%) and low oxygen content (lower than or equal to 0.26%); mainmechanical properties of the alloy are higher than level of common deformed titanium alloy; and cost is obviously lower than that of conventional powder metallurgical titanium alloy.

Description

technical field [0001] The invention belongs to the technical field of preparation and processing of titanium and titanium alloys, and in particular relates to a method for manufacturing powder metallurgy titanium, titanium alloys and parts thereof by using hydrogenated sponge titanium as a raw material. Background technique [0002] Titanium alloy has outstanding advantages such as low density, the highest specific strength among metal structural materials, excellent corrosion resistance and heat resistance, and non-magnetic properties. The fields of manufacturing, biomedicine and sports leisure show very attractive and broad application prospects, and it is an extremely important structural material and strategic material. However, due to the high temperature activity, high deformation resistance and poor processing performance of titanium alloys, the conditions for preparation, processing and forming of titanium alloys are harsh, which ultimately results in high costs for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00B22F1/00B22F3/105B22F3/24B22F1/145
CPCC22C1/0458C22C14/00B22F3/105B22F3/24B22F2998/10B22F1/145B22F9/04B22F3/02Y02P10/25
Inventor 牛红志张德良孙倩倩张海瑞
Owner NORTHEASTERN UNIV
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