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Low-temperature high-speed superplastic forming method for zirconium diboride-based superhigh-temperature ceramics

A technology of ultra-high temperature ceramics and zirconium diboride, which is applied in the forming field of ultra-high temperature ceramics, can solve the problems of inaccessible net forming of ultra-high temperature ceramics, and achieve the effect of improving the deformation ability.

Active Publication Date: 2021-05-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that ultra-high temperature ceramics are difficult to near-net shape, and provide a solution for high-precision near-net shape parts of complex shapes such as thermal protection parts of hypersonic aircraft and heat-resistant parts of engines with high thrust-to-weight ratio

Method used

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  • Low-temperature high-speed superplastic forming method for zirconium diboride-based superhigh-temperature ceramics
  • Low-temperature high-speed superplastic forming method for zirconium diboride-based superhigh-temperature ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1) Configuration and grinding of raw materials

[0024] Weighing zirconium diboride and zirconium disilicide powders with a volume ratio of 70:30 and putting them into a ball mill jar, wherein the purity of zirconium diboride and zirconium disilicide is 99.9%, and the average particle size is 1-3 microns; Add large tungsten carbide balls and small tungsten carbide balls with a quantity ratio of 1:3 and keep the mass ratio of the mass of the grinding balls to the raw material powder at 10:1; Polyethylenimine anhydrous ethanol solution was used as the grinding medium; vacuum-filled with argon, and circulated for 3 times; finally, it was ball-milled on a planetary ball mill at a speed of 250 rpm for 48 hours to obtain a mixed slurry of nano-sized particles. The obtained mixed slurry was placed in a vacuum drying oven, vacuumed to 0 bar, vacuum-dried at a constant temperature of 30° C. for 5 hours and then cooled to room temperature for 3 hours to obtain a dry powder.

[0...

Embodiment 2

[0030] Similar to the steps in Example 1, the difference is that the volume ratio of zirconium diboride to zirconium disilicide is 80:20; sintering at 1400 ° C for 30 min; superplastic forming temperature is 1500 ° C, and the strain rate is 10 -4 , the applied load was 60MPa, and the forming time was 110min, resulting in a compression deformation of 65%. The surface of the product is smooth and without cracks.

Embodiment 3

[0032] Similar to the steps in Example 1, the difference is that the superplastic forming temperature is 1500 ° C, and the strain rate is 10 -3 , the applied load was 20MPa, and the forming time was 17min, resulting in a compression deformation of 101%. The surface of the product is smooth and without cracks.

[0033] In summary, a low-temperature, high-speed superplastic forming method for zirconium diboride-based ultra-high temperature ceramics introduces an appropriate amount of disilicide inside zirconium diboride to change the grain boundary morphology of zirconium diboride, thereby greatly improving The superplastic deformation ability of ultra-high temperature ceramics. enabling it to operate at higher initial strain rates (10 -4 -10 -1 the s -1), lower temperature (1300-1600°C), and lower stress (20-60MPa), in a shorter time (5-120min) to achieve more than 100% deformation and no cracks, for The near net shape process production of ultra-high temperature ceramic c...

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Abstract

The invention provides a low-temperature high-speed superplastic forming method for zirconium diboride-based ultrahigh-temperature ceramics, and belongs to the field of forming of ultrahigh-temperature ceramics. The method comprises the following steps: introducing a proper amount of disilicide into zirconium diboride to obtain nano ceramic powder, sintering the nano ceramic powder to obtain a sintered green body, and under the combined action of a specific temperature interval and stress, obtaining an ultra-high-temperature ceramic product close to the final shape in a short time by utilizing a superplastic extrusion mode; and performing fine grinding to obtain the ultra-high-temperature ceramic part. The improved ultra-high-temperature ceramic can achieve plastic deformation exceeding 100% within a short time under the conditions of high initial strain rate, low temperature and low stress, and superplastic forming of the material has engineering application significance. By means of the method, near-net forming of an ultra-high-temperature ceramic component in a complex shape can be achieved, and the problem that zirconium diboride-based ultra-high-temperature ceramic is difficult to machine due to high hardness, large brittleness and the like is solved.

Description

technical field [0001] The invention belongs to the forming field of ultra-high temperature ceramics, in particular to a low-temperature, high-speed superplastic forming method of zirconium diboride-based ultra-high temperature ceramics. Background technique [0002] Zirconium diboride (ZrB 2 )-based ultra-high temperature ceramics have superior mechanical properties such as stiffness, hardness and strength, have extremely high melting point and chemical stability, and have excellent oxidation resistance and ablation resistance in high-temperature aerobic environments. Therefore, this material is the preferred structural material for long-term service in extreme environments such as ultra-high temperature, aerobic or neutral atmosphere, and complex loads. It can be widely used in industries such as thermal protection components of hypersonic aircraft, high thrust-to-weight ratio engines, and ultra-high temperature electrodes. field. [0003] Ultra-high-temperature ceramic ...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/626C04B41/80
CPCC04B35/58078C04B35/622C04B35/62615C04B41/80C04B41/0072C04B41/009C04B2235/3891
Inventor 祖宇飞田洪亮刘应军徐一魏志帆沙建军代吉祥陈国清
Owner DALIAN UNIV OF TECH
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