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Preparation method of ZrB2 fibers

A fiber and raw material technology, which is applied in the field of ZrB2 fiber preparation, can solve the problems that the reinforcement phase does not have special high temperature resistance and the overall performance decline, and achieves the effects of easy mass production, poor fracture toughness, and economic and environmental protection in the preparation process

Inactive Publication Date: 2017-12-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this problem, some scholars added a second phase to modify it, but because the enhancement phase does not have ZrB 2 The special high temperature resistance of the matrix will lead to a decrease in the overall performance, and there are also problems with the compatibility of the two substances. Using ZrB 2 fiber reinforced ZrB 2 Ceramics can solve the compatibility problem of adding a second phase

Method used

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  • Preparation method of ZrB2 fibers
  • Preparation method of ZrB2 fibers
  • Preparation method of ZrB2 fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment adopts ZrO 2 Fiber content ≥ 99.7%, the purity of the Mg powder ≥ 99.9%, the B 2 o 3 The purity of ≥98.8%, by mass percentage, ZrO in the raw material 2 The fiber is 36%, the Mg powder in the raw material is 42%, and the B in the raw material 2 o 3 is 22%, and the sum of the mass percentages is 100%.

[0026] Pour the weighed raw materials into the mortar, stir to make the various raw materials fully and evenly mixed, weigh the mixed materials and place them in the abrasive tool of the powder tablet press, and use the powder tablet press to form, the forming pressure is 1MPa, Then release the pressure and demould, and finally make a cylindrical sample with a diameter of 20mm. During the combustion synthesis, put the sample in the sample stage, evacuate the argon gas, pressurize to 1.5Mpa, and then ignite, and the reaction is completed within 1-2s. The reacted sample was pickled in 10% hydrochloric acid to remove MgO and remaining Mg in the product....

Embodiment 2

[0029] This embodiment is based on mass percentage, on the basis of Example 1, the MgCl that accounts for 3% of the total mass of raw materials is added 2 .

[0030] Carry out X-ray diffraction analysis to the sample after pickling, obtain XRD collection of patterns, see image 3 , it can be seen from the XRD results that adding MgCl 2 The phase composition of the final product is ZrB 2 , ZrO 2 , Mg 3 B 2 o 6 . Carry out SEM analysis to the product, participate in Figure 4 , it can be seen that the morphology of the fibers in the synthesized product has changed.

Embodiment 3

[0032] This embodiment is based on mass percentage, on the basis of Example 1, Na 2 B 4 o 7 12% of the total mass of raw materials, mixed with MgCl 2 6% of the total mass of raw materials.

[0033] Carry out X-ray diffraction analysis to the sample after pickling, obtain XRD collection of patterns, see Figure 5 , it can be seen from the XRD results that adding Na 2 B 4 o 7 , MgCl 2 The phase composition of the final product is ZrB2 , ZrO 2 , Mg 3 B 2 o 6 . Carry out SEM analysis to the product, participate in Figure 6 , it can be seen that the fibers in the generated product are relatively dense, mainly because the molten salt reduces the volatilization of substances during the reaction process.

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Abstract

The invention discloses a preparation method of ZrB2 fibers. Raw materials used by the preparation method comprise Mg, ZrO2 fibers, B2O3 and a salt-melting auxiliary agent (comprising MgCl2, Na2B4O7 and the like); the preparation method comprises the following steps: firstly, preparing materials according to requirements; after uniformly mixing the materials, putting a mixture into a powder tablet press and pressing the mixture into a cylindrical test sample; putting the sample into a test sample platform; vacuumizing and introducing argon gas; pressurizing and igniting; after reacting, taking out the test sample; carrying out acid washing, suction filtering and drying to obtain a needed product. The preparation method disclosed by the invention has the advantages of short reaction time, low energy consumption and high yield; pure ZrB2 fibers are hopefully obtained through the acid washing and can be used as a spare material of hypersonic flight vehicles, across-atmospheric flight vehicles and rocket propulsion systems.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a ZrB 2 Methods of making fibers. technical background [0002] Near-space hypersonic vehicles fly in a special near-space environment, and the most critical technical issue involved is the material technology suitable for hypersonic flight in this environment. ZrB 2 Ceramics are not only able to withstand ultra-high temperatures, but also maintain performance stability during rapid heating, and have the advantages of high hardness, low density, high thermal conductivity, etc., and become an alternative material for hypersonic aircraft. But ZrB 2 The fracture toughness of ceramics is poor. On February 1, 2003, during the process of returning to the atmosphere, the US space shuttle "Columbia" hit the bottom of the left wing of the space shuttle due to the falling off of objects near the attachment point of the external fuel tank. , leading to cracks in the heat-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04C04B35/622C04B35/80
CPCC01B35/04C01P2002/72C01P2004/03C04B35/62277C04B35/806C04B2235/3246C04B2235/3409
Inventor 任耘周盼肖国庆丁冬海种小川
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY