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Preparation method of aluminium base zirconium tungstate particle composite material

A composite material, aluminum-based tungstic acid technology, applied in the field of aluminum-based materials, can solve the problems of affecting negative thermal expansion performance, particle content limitation, difficult to fully densify, etc., and achieve the effect of high bonding strength and high volume fraction ratio.

Inactive Publication Date: 2006-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this composite ZrW 2 o 8 The particle content is limited and it is not easy to be fully dense; there is an oxide film on the surface of the metal powder, which affects the relationship between metal particles and the relationship between metal particles and ZrW 2 o 8 Combination between particles, excessive thermocompression pressure leads to ZrW 2 o 8 Phase transition, affecting negative thermal expansion properties, too high hot-pressing temperature leads to ZrW 2 o 8 Decompose or react with metal particles

Method used

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  • Preparation method of aluminium base zirconium tungstate particle composite material
  • Preparation method of aluminium base zirconium tungstate particle composite material
  • Preparation method of aluminium base zirconium tungstate particle composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. ZrW 2 o 8 Preparation of powder Put 65g of zirconium oxychloride (ie: 0.2mol) in 200ml of deionized water and stir repeatedly, and another 106g of ammonium paratungstate (ie: 0.4mol) in 400ml of deionized water and repeatedly stir (ie: 0.2mol); Mix the zirconium oxychloride solution with the ammonium paratungstate solution prepared above under strong stirring conditions, add ammonia water and hydrochloric acid to adjust the pH value to 4.0; Clear liquid; after drying in a drying oven at 100°C, grind it finely, press it into a compact with a diameter of 25mm under a pressure of 100MPa, and place it in a sintering furnace at 600°C for 13 hours; then place it in a sintering furnace at 1200°C Reaction in the furnace for 3 hours; grinding for 40 minutes into powder.

[0027] figure 1 It is the ZrW synthesized by the reaction of Example 1 2 o 8 X-ray diffraction pattern of the powder, except a very small amount of WO 3 In addition, it is basically a single phase ZrW ...

Embodiment 2

[0036] 1. ZrW 2 o 8 Preparation of powder Put 65g of zirconium oxychloride (ie: 0.2mol) in 200ml of deionized water and stir repeatedly, and another 106g of ammonium paratungstate (ie: 0.4mol) in 400ml of deionized water and repeatedly stir (ie: 0.2mol); Mix the zirconium oxychloride solution with the ammonium paratungstate solution prepared above under strong stirring conditions, add ammonia water and hydrochloric acid to adjust the pH value to 4.0; Clear liquid; after drying in a drying oven at 100°C, grind it finely, press it into a compact with a diameter of 25mm under a pressure of 100MPa, and place it in a sintering furnace at 600°C for 13 hours; then place it in a sintering furnace at 1200°C Reaction in the furnace for 3 hours; grinding into powder for 2 hours.

[0037] 2. ZrW 2 o 8 / Al6013 composite material will be prepared ZrW 2 o 8 The powder is compressed into a preform with a diameter of 45mm under a pressure of 377MPa, and placed in a heat-resistant steel (...

Embodiment 3

[0045] 1. ZrW 2 o 8 Preparation of powder: Put 55g of ammonium paratungstate (ie: 0.20mol) in a mortar and grind it finely, put it into a beaker, add nitric acid and stir, adjust the pH value to 1.0, after the ammonium paratungstate is completely dissolved, add ammonia water to make the pH value 7.0, stir When the solution is clear, nitric acid is added to adjust the pH value to 5.0.

[0046] Dissolve 33.17g of zirconium oxychloride (ie: 0.103mol), mix the zirconium oxychloride solution with the ammonium paratungstate solution prepared above under strong stirring conditions, and add nitric acid to keep the pH value at 4.0; continue stirring for 1 hour After standing still for several hours until the supernatant appears in the upper layer, suck out the supernatant; dry it in a drying oven at 100°C and grind it finely, press it into a compact with a diameter of 25mm under a pressure of 100MPa, and place it in a sintering chamber at 600°C React in the furnace for 13 hours, and ...

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Abstract

A process for preparing Al-based ZrW2O8 (or SiCp=ZrW2O8) particle composition with high compactness and strength and near zero expansibility includes such steps as prefabricating the blank of ZrW2O8 (or SiCp=ZrW2O8) particles, preheating it, penetrating the molten Al in the gaps between said particles, and quick solidifying.

Description

Technical field: [0001] The invention belongs to aluminum-based materials in the field of metallurgy, especially aluminum-based ZrW 2 o 8 Particle composite material and preparation method. Background technique: [0002] Oxide ZrW 2 o 8 It has strong isotropic negative thermal expansion, wide temperature range, and stable negative thermal expansion coefficient. It is a structural and functional material with great application potential. [0003] Currently, the ZrW 2 o 8 The powder is mixed with copper or aluminum powder and hot-pressed to adjust the thermal expansion of the material. But in this composite ZrW 2 o 8 The particle content is limited and it is not easy to be fully dense; there is an oxide film on the surface of the metal powder, which affects the relationship between metal particles and the relationship between metal particles and ZrW 2 o 8 Combination between particles, excessive thermocompression pressure leads to ZrW 2 o 8 Phase transition, affect...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C21/00C22C1/10
Inventor 陈康华黄兰萍罗丰华周兴华彭迪戴恩斌
Owner CENT SOUTH UNIV
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