Method for preparing nano composite low melting point glass insulation coating

A low-melting-point glass and insulating coating technology, which is applied in the field of preparation of nano-composite low-melting-point glass insulating coatings, can solve the problems of high price, environmental pollution, and affecting the insulation performance of the coating, so as to improve the insulation strength and compact structure Effect

Inactive Publication Date: 2010-01-13
宁波材料技术与工程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this inorganic insulating layer and its preparation method have disadvantages. First, the formation of the slurry needs to use an organic solvent, which is not only expensive, but also easily pollutes the environment; secondly, the formed glass insulating layer material The coefficient of thermal expansion is only 7.3×10 -6 / °C, lower than the thermal expansion coefficient of general metal base materials, due to the mismatch between the two, it is easy to cause cracks during use and affect the insulation performance of the final coating

Method used

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  • Method for preparing nano composite low melting point glass insulation coating
  • Method for preparing nano composite low melting point glass insulation coating
  • Method for preparing nano composite low melting point glass insulation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: complete preparation according to the following steps: 1), first SiO 2 -B 2 o 3 Low-melting point glass powder and nano-ceramic powder are mixed with sodium silicate and deionized water (or distilled water) according to the ratio of 100:5:30:200; wherein, SiO 2 -B 2 o 3 Based on the low melting point glass powder, according to SiO 2 25wt%, B 2 o 3 10wt%, ZnO20wt%, CaO7wt%, MgO5wt%, BaO4wt%, Na 2 O15wt%, K 2 O13.4wt% and Al 2 o 3 The proportion of 0.6wt% is taken from the raw materials, mixed and ball milled for 5 hours, then melted at 1000°C for 80 minutes, and then quenched in water and ball milled for 5 hours to obtain a solid powder. The nano-ceramic powder is oxidized Aluminum powder. The mixture was then placed in a ball mill jar and mixed and ground on a planetary ball mill for 10 hours to obtain a mixed slurry. 2), first spin-coat (or spray or dip) the surface of the metal base copper (or semiconductor base or superconductor base) with the...

Embodiment 2

[0013] Embodiment 2: complete preparation according to the following steps: 1), first SiO 2 -B 2 o 3 Low-melting point glass powder and nano-ceramic powder are mixed with sodium silicate and deionized water (or distilled water) according to the ratio of 100:20:23:250; wherein, SiO 2 -B 2 o 3 Based on the low melting point glass powder, according to SiO 2 30wt%, B 2 o 3 25wt%, ZnO12wt%, CaO4wt%, MgO1wt%, BaO5wt%, Na 2 O13wt%, K 2 O9.7wt% and Al 2 o 3 The ratio of 0.3wt% is prepared to take raw materials, mix them and ball mill for 6.3 hours, then melt at 1100°C for 68 minutes, and then quench in water and ball mill for 6.3 hours to obtain a solid powder. The nano-ceramic powder is oxidized Aluminum powder. The mixture was then placed in a ball mill jar and mixed and ground on a planetary ball mill for 8.3 hours to obtain a mixed slurry. 2), first spin-coat (or spray or dip) the surface of the metal base copper (or semiconductor base or superconductor base) with the ...

Embodiment 3

[0014] Embodiment 3: complete preparation according to the following steps: 1), first SiO 2 -B 2 o 3 Low-melting point glass powder and nano-ceramic powder are mixed with sodium silicate and deionized water (or distilled water) according to the ratio of 100:35:15:300; wherein, SiO 2 -B 2 o 3 Based on the low melting point glass powder, according to SiO 2 35wt%, B 2 o 3 20wt%, ZnO8wt%, CaO9wt%, MgO6wt%, BaO3wt%, Na 2 10wt%, K 2 O7.8wt% and Al 2 o 3 The ratio of 1.2wt% is prepared by taking raw materials, mixing them and ball milling for 7.5 hours, then melting at 1200°C for 55 minutes, and then quenching in water and ball milling for 7.5 hours to obtain a solid powder. The nano-ceramic powder is oxidized Aluminum powder. Then the mixture was placed in a ball mill jar and mixed and ground on a planetary ball mill for 7.5 hours to obtain a mixed slurry. 2), first spin-coat (or spray or dip) the surface of the metal base copper (or semiconductor base or superconductor ...

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Abstract

The process of preparing nanometer composite insulating low smelting point glass coating includes the following steps: 1. preparing mixed slurry through mixing low smelting point SiO2-B2O3 glass powder, nanometer ceramic powder, two or more of sodium silicate, silica sol, methyl cellulose and polyethylene glycol, and water in the weight ratio of 100 to 5-60 to 1-30 to 200-400 and ball milling for 5-10hr; 2. coating the slurry onto substrate, drying at 80-120 deg.c for 10-30 min, and heat treatment first at 350-450 deg.c for 30-60 and then at 500-700 deg.c for 5-30 min; and 3. repeating the step 2 by 3-10 times to prepare the nanometer composite insulating low smelting point glass coating. The preparation process has low cost and no environmental pollution, and the coating has relatively high heat expansion coefficient matching the metal substrate and excellent high temperature insulating performance.

Description

technical field [0001] The invention relates to a method for preparing an insulating coating, in particular to a method for preparing a nanocomposite low-melting glass insulating coating. Background technique [0002] Inorganic insulating coating materials with the advantages of high temperature resistance and high dielectric strength can replace organic polymer insulating materials to meet the high insulation performance requirements of instruments and equipment under high temperature (~400°C) conditions. It has broad application prospects. As one of the inorganic insulating coating materials, low-melting glass has low melting point and high thermal expansion coefficient (greater than 10×10 -6 / °C), so that it can prepare dense insulating coating at a lower temperature, and can alleviate the advantages of coating cracking caused by the mismatch of thermal expansion coefficient with the base material; however, it has the advantages of high thermal expansion coefficient and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/02C03C12/00C03C3/066C03C3/093
CPCC03C3/066C03C3/093
Inventor 杨晔胡坤郑康陈林孙爱华李勇崔平方前锋田兴友
Owner 宁波材料技术与工程研究所
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