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Prestressing tendon reinforced composite material and manufacturing method thereof

A technology for reinforcing composite materials and pre-existing stress tendons, which is applied in the field of preparing the pre-existing stress tendons reinforced composite materials, and can solve the problems affecting the safety, reliability, durability, easy cracking, and poor reliability of components

Active Publication Date: 2012-09-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, such a high-strength reinforcement is composited with ceramics. If the fibers and matrix in the composite material are in a state of low stress or no stress, these ultra-high-strength fibers basically have no effect on crack resistance before the ceramic matrix cracks. Therefore, due to the cracking of the ceramic matrix, the safety, reliability and durability of the components are seriously affected, and it also causes a very large excess of fiber strength.
Therefore, even ultra-high modulus fibers cannot solve this difficult problem, not to mention that the higher the elastic modulus, the worse the toughness of the composite material, and the problem of brittleness of ceramics has not been solved.
It is particularly worth mentioning that ceramic-based automobile engines have not been developed because of their poor toughness, easy cracking, and poor reliability.

Method used

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  • Prestressing tendon reinforced composite material and manufacturing method thereof
  • Prestressing tendon reinforced composite material and manufacturing method thereof
  • Prestressing tendon reinforced composite material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] C / C outer tube 3, Si core pre-stored stress tendons 7 reinforced Si 3 N 4 The steps of the preparation method of the ceramic matrix composite material are as follows:

[0068] (1) Preparation of pre-existing stress tendon precursor 6: Si material is used as the core material in this example. Since elements such as C, N, or O have strong pinning dislocation capabilities in Si materials, a certain The amount of these elements can improve the shear strength, compressive strength and elastic modulus of the Si core body 4, but at the same time will increase the service temperature T of the Si core body 4. o .

[0069] The core body 4 of this embodiment adopts the Si material doped with a small amount of N impurities, and the doped N impurity concentration is 10 15 ~10 20 / cm 3 Make it use temperature T o reaches 800°C, its T m The temperature was 1410°C. Such as figure 1 As shown, a plurality of T300 carbon fibers 1 that are woven or arranged in a single direction ...

Embodiment 2

[0079] C / C outer tube 3, Si core body pre-stored stress ribs 7 The preparation method of reinforced SiC ceramic matrix composite material is as follows:

[0080] (1) Preparation of pre-existing stress tendon precursor 6: Si material is used as the core material in this example. Since elements such as C, N, or O have strong pinning dislocation capabilities in Si materials, a certain The amount of these elements can improve the shear strength, compressive strength and elastic modulus of the Si core body 4, but at the same time will increase the service temperature T of the Si core body 4. o . For example, when C is added, as the content ratio of C in the core 4 increases, the shear strength, compressive strength and elastic modulus of the core increase accordingly. When the mole fraction of C is 50%, the core 4 material becomes a SiC ceramic material, and the T of SiC m It is around 2000°C, so by adjusting the content of C in Si, the T of the Si core m The temperature is modu...

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Abstract

The invention discloses a prestressing tendon reinforced composite material and a manufacturing method of the prestressing tendon reinforced composite material. comprising the following steps of: arranging prestressing tendons according to stress condition of a composite material; weaving the prestressing tendons and fibers to form a prefabricated body or using the prestressing tendons individually to form the prefabricated body; preparing the composite material by chemical vapor infiltration method (CVI); heating up to Tm temperature of a core body to soften the core body; and releasing prestress when an outer pipe retracts elastically to compress a combined base body. According to the invention, due to the arrangement flexibility and convenience of the prestressing tendons, the tendons are arranged according to the principal tensile stress trace, so that the stress performance of the structure ceramics or carbon base is improved better, the toughness and strength of the ceramic or carbon-based composite material are strengthened, and the problem that the continuous fiber reinforced ceramic or carbon-based composite material matrix cracks too early is solved.

Description

technical field [0001] The invention relates to a pre-stored stress tendon reinforced composite material, and also relates to a method for preparing the pre-stored stress tendon reinforced composite material. Background technique [0002] It is precisely because of its high temperature resistance, oxidation resistance, high wear resistance, high hardness, corrosion resistance, high compressive strength and many other excellent properties that ceramic materials are ubiquitous in today's world. It is used in aerospace, machinery, Electronics, energy and other military and civilian industries have irreplaceable contributions and functions. However, the Achilles heel of ceramics is their high brittleness and very low tensile strength. They are particularly sensitive to defects such as cracks, pores, and impurities, which greatly limits It is applied in many fields. Therefore, the majority of experts and scholars have made unremitting efforts to study and improve the brittleness...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/622
Inventor 王子国李显方
Owner CENT SOUTH UNIV
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