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Current direct heating powder hot extrusion preparation method and device for fiber orientation reinforced composite

A reinforced composite material and fiber orientation technology, which is applied in the field of fiber-oriented reinforced composite material current direct heating powder hot extrusion preparation method and device, can solve problems such as fiber breakage and product performance degradation, to avoid breakage, improve heating efficiency, The effect of improving product productivity

Active Publication Date: 2017-10-24
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the existing hot extrusion process, a faster extrusion rate is usually used to avoid the temperature drop of the billet and the excessive temperature of the mold, but for the brittle second phase, this rapid extrusion method often leads to fiber breakage, resulting in a decrease in product performance

Method used

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  • Current direct heating powder hot extrusion preparation method and device for fiber orientation reinforced composite
  • Current direct heating powder hot extrusion preparation method and device for fiber orientation reinforced composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment adopts electric current direct heating dynamic sintering hot-press furnace, as figure 1 As shown, the hot extrusion die in this example is as figure 2 As shown, the ceramic insulating layer is made of alumina ceramics, and the other parts are made of silicon carbide.

[0019] The fibrous tin oxide was prepared, and the silver-tin oxide composite powder was prepared by chemical coating method. The composite powder was cold-pressed into a green body under a pressure of 10 MPa and then loaded into a hot extrusion die from the feed port, and then Load spacers and hot extrusion punches. Put the hot extrusion mold into the electric current direct heating dynamic sintering hot pressing furnace, insert a K-type thermocouple, pass argon gas into the insulation jacket, pass cooling circulating water to the electrodes of the hot press machine, apply a pressure of 10 MPa and power on. When the temperature rises to 600°C, the pressure will be increased for simulta...

Embodiment 2

[0021] In this example, the ceramic insulating layer of the hot extrusion die is made of alumina ceramic coating, and the other parts are made of high-purity graphite.

[0022] The precious metal iridium is processed into a size that matches the feed inlet, and loaded into the hot extrusion die from the feed inlet, and then loaded with gaskets and hot extrusion punches. Put the hot extrusion mold into the current direct heating dynamic sintering hot pressing furnace, measure the temperature through the infrared temperature measuring device, pass argon gas into the insulation jacket, and pass cooling circulating water into the electrodes of the hot press machine, apply a pressure of 10 MPa and power ups. When the temperature rises to 1800°C, the pressure will be increased for simultaneous hot extrusion and hot sintering. The extrusion rate is 0.1mm / min. The extrusion rate is determined by the stroke of the upper and lower working tables. When the stroke reaches the thickness of...

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Abstract

The invention discloses a current direct heating powder hot extrusion preparation method and device for a fiber orientation reinforced composite. A blank is heated through current direct heating, and powder can be subjected to synchronous sintering and hot extrusion. The preparation method comprises the steps of pressing composite powder containing second phases of hard brittle-phase fibers into the blank, putting the blank into a mold, putting the mold into a current direct heating dynamic sintering furnace, and carrying out sintering and hot extrusion at the pressure of 5 MPa to 90 MPa and the temperature of 300 DEG C to 3000 DEG C. The device comprises the current direct heating dynamic sintering hot extrusion furnace and the hot extrusion mold, wherein the mold is processed through graphite, silicon carbide or molybdenum disilicide; and ceramic insulating layers are embedded in the inner walls of a feed section and a deformation section. Through adoption of the device and the method, the composite can be subjected to hot extrusion at relatively low deformation speed, hard brittle fibers in the prepared fiber reinforced composite are arranged parallel to the wire direction and do not break, and the composite embodies excellent performance.

Description

technical field [0001] The invention relates to a method and device for hot extrusion preparation, in particular to a method and device for hot extrusion preparation of fiber-oriented reinforced composite material current direct heating powder hot extrusion. Background technique [0002] Hot extrusion technology is a method of heating metal materials to the hot forging forming temperature for extrusion. The usual practice is to heat the billet to a temperature above the metal recrystallization temperature before extrusion. At the hot forging temperature, the material has a better shape, and the extrusion process of the metal can be realized under the condition of applying a lower load. Therefore, hot extrusion technology has been widely used in the preparation of long parts, profiles, pipes, rods and various machine parts of ordinary equal cross-sections, and is an important means of shaping. At present, the commonly used hot extrusion method is to heat the billet to the ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/20
CPCB22F3/002B22F3/003B22F3/20B22F2003/208
Inventor 孙旭东林智杰惠宇刘旭东毕孝国
Owner DALIAN UNIV