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Aluminum dihydrogen phosphate impregnant

A technology of aluminum dihydrogen phosphate and impregnating agent, which is applied in the field of impregnating agent, which can solve the problems of high sintering temperature, low solid phase content, and instability of intermediate products, and achieve the effect of high sintering degree and improved ceramic yield

Inactive Publication Date: 2018-05-29
韩会义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aluminum dihydrogen phosphate is used as an impregnating agent, but there are problems such as low solid content, unstable intermediate products during high temperature treatment, high sintering temperature and loose and porous sintered products, which greatly affect the surface densification effect and increase the number of impregnation treatments. Affects the performance of silicon nitride combined with silicon carbide ceramic matrix, and increases the cost of densification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0018] The preparation method of aluminum dihydrogen phosphate impregnating agent is as follows: adopt P / Al atomic number ratio to be 3 / 1.04 preparation Al(H 2 PO 4 ) 3 . Take the density as ρ=1.709g / cm 3 , 500mL of phosphoric acid solution with a concentration of 85% (in which the amount of P substance is 7.41mol) is added with water at 100°C to prepare 1000mL of phosphoric acid aqueous solution. 200g pure Al(OH) 3 Powder slowly added to phosphoric acid aqueous solution, stirred and evaporated to saturation, and Al(H 2 PO 4 ) 3 saturated solution (AHP).

Embodiment example 2

[0020] Combined with the theoretical changes in the sintering process of aluminum dihydrogen phosphate, the sintering process of aluminum dihydrogen phosphate is formulated: weigh 50g of the impregnating solution and put it in a 105°C oven to dry to constant weight, and then place it in a high-temperature furnace under the protective atmosphere of air and nitrogen. burn in. According to the phase transition process, the heating curve is set as: room temperature ~ 250°C (30min) ~ 300°C (1.5h) ~ 400°C (30min) ~ 500°C (1h) ~ 800°C (1h) ~ 1300°C (2h). Among them, the temperature rise rate is 2°C / min from room temperature to 400°C, 3°C / min from 400°C to 800°C, and 5°C / min from 800°C to 1300°C. Results and analysis: Al(H 2 PO 4 ) 3 The degree of sintering is high, the pores and porosity are small, and most of the particles are sintered together to form an obvious sintered phase. It can be seen from EDS that the atomic ratio of aluminum, phosphorus and oxygen in the sintered prod...

Embodiment example 3

[0022] According to every 100mL saturated Al(H 2 PO 4 ) 3 Add 10g nano-SiO 2 (Industrial grade, average particle size 100nm) to prepare nano-SiO 2 Strengthen the impregnation solution of aluminum dihydrogen phosphate, fully disperse and mix it in an ultrasonic disperser to form a stable suspension, and add water to adjust to an appropriate consistency. Sintering in air to produce nano-SiO 2 Reinforced aluminum dihydrogen phosphate impregnated sintered material (SAHP). Results and Analysis: Nano-SiO 2 The addition of sintered aluminum dihydrogen phosphate saturated solution increased the ceramic yield from 52% to 58%. At the same time, it increased the density of the sintered body and greatly reduced the pores of the aluminum dihydrogen phosphate sintered body. A relatively dense film is formed, and unreacted agglomerated nano-SiO 2 Wrapped and protected by aluminum phosphate film, it will not react with metal aluminum liquid and cause aluminum liquid pollution. nano-Si...

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Abstract

An aluminum dihydrogen phosphate impregnant is disclosed. A phosphoric acid solution with a concentration of 85% and pure Al(OH)3 powder are used to prepare an Al(H2PO4)3(AHP) solution with a P / Al atomic ratio of 3 / 1.04, and Nano-SiO2 and ultra-fine SiC powder are used for modifying the Al (H2PO4) 3 impregnant. When the Al(H2PO4)3 is sintered in air at 1300DEG C, a product is a mixture of Al(PO3)3and AlPO4; when the Al(H2PO4)3 is sintered in a nitrogen atmosphere, the product is mainly AlPO4, and the degree of sintering is high; and the nano-SiO2 is more conducive to the formation of an aluminum phosphate dense film compared with the ultra-fine SiC powder.

Description

technical field [0001] The invention relates to an impregnating agent, in particular to an aluminum dihydrogen phosphate impregnating agent. Background technique [0002] The aluminum phosphate binding phase mainly refers to the intermediate phase produced during the process of aluminum phosphate and aluminum dihydrogen phosphate and its phase transition temperature. Aluminum dihydrogen phosphate has the advantages of high solubility, low solution viscosity, good stability of high-temperature sintered products, and no influence on the properties of silicon nitride and silicon carbide materials. It is not only commonly used as a binder for silicon carbide refractory materials, but also as an aluminum Alloy low-pressure casting electromagnetic pump silicon nitride combined with silicon carbide pump body material surface densification impregnating agent. [0003] Aluminum dihydrogen phosphate is used as an impregnating agent, but there are problems such as low solid content, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
CPCC04B41/85C04B41/5048
Inventor 韩会义
Owner 韩会义
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