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A composite manufacturing technology of ceramic and titanium alloy assisted by frequency conversion ultrasonic

A frequency conversion ultrasonic and titanium alloy technology, applied in the field of frequency conversion ultrasonic assisted composite casting of ceramics and titanium alloys, can solve the problems of low elastic modulus, achieve high density, easy to popularize and apply, and improve crack resistance

Inactive Publication Date: 2019-11-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(3) Low elastic modulus, the elastic modulus of titanium alloy (annealed state) is 1.076×10-1.178×10MPa, which is about half of that of steel and stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Take alumina as the ceramic material and TC4 as the titanium alloy as an example for illustration. The specific implementation steps are as follows:

[0019] The first step: place the alumina ceramic matrix in the mold and wait for the alloy liquid to pour.

[0020] The second step: pour TC4 titanium alloy liquid into the mold for casting. The preparation operation of the alloy liquid is as follows, firstly, smelting preparation is carried out. Determine the smelting temperature according to the melting point of TC4 titanium alloy, formulate the smelting process, clean the raw materials and containers, smelt according to the capacity of the smelting furnace and the amount of TC4 alloy to be smelted, check the integrity of the smelting furnace system, strictly carry out necessary openings such as furnace cleaning Furnace ready. Use a mechanical pump to pre-evacuate to 6×10-2Pa. After preheating the diffusion pump for 30min-1h, slowly open the furnace body valve. When ...

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Abstract

The invention relates to a technical method for composite casting of ceramic and a titanium alloy through assistance of variable-frequency ultrasonic waves. The method aims to solve the problem that the ceramic is fragile, and can reduce the stress of the ceramic and avoid cracking of the ceramic. An ultrasonic solidification technology can enable molten titanium alloy to be well combined with a ceramic matrix, the variable-frequency ultrasonic waves assist in the casting process, so that segregation of the titanium alloy in the solidification process is reduced in the casting process, a finegrained area is enlarged, and formation of developed dendritic crystals is reduced; and the ceramic matrix is coated with the molten titanium alloy, so that the crack resistance of the ceramic material is improved. The molten titanium alloy is prepared by adopting a non-consumable vacuum smelting furnace, wherein a titanium alloy bar is made into consumable electrodes, electric arc heat is generated through discharge between the electrodes under the vacuum condition, and the titanium alloy bar is rapidly heated to a high temperature and then melted to obtain the molten titanium alloy. In the casting and cooling process of the molten titanium alloy, due to solidification and shrinkage of the molten titanium alloy, a pressure stress is applied to the surface of the ceramic matrix, and therefore cracks cannot be easily generated in the using process of the ceramic, and the material integrating the advantages of the ceramic and the titanium alloy is obtained.

Description

technical field [0001] The invention belongs to the technical method of frequency conversion ultrasonic assisted composite casting of ceramics and titanium alloys, and is a method for improving the complex stress service ability of ceramics with high hardness but poor plasticity. Background technique [0002] Ceramic material is an indispensable material in human life and production. It has been paid attention to because of its high temperature resistance, corrosion resistance, wear resistance, rich raw materials, low cost and many other advantages. Whether in the aerospace, petrochemical, shipbuilding, machinery or decoration industries, the application of ceramic products can be said to pervade all fields of the national economy and play an important role in the development of human society. However, as inorganic non-metallic ceramic materials, most of the crystal structures are ionic crystals. This kind of chemical bond has high binding energy and low expansion coefficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/08B22D27/20C22C1/02C22C14/00
CPCB22D19/08B22D27/20C22C1/02C22C14/00
Inventor 李洪洋曾申涛蔡艾君宋明龙张晶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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