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Lightweight high-strength microcrystal ceramic insulation board and preparation method thereof

A technology of microcrystalline ceramics and thermal insulation boards, applied in the field of building thermal insulation materials, can solve the problems affecting the application occasion and service life of products, low degree of ceramic crystallization, low thermal conductivity, etc., and achieve good comprehensive performance and performance, water absorption. The effect of reducing and improving wear resistance

Inactive Publication Date: 2012-09-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although this type of ceramic insulation board has the characteristics of high porosity and low thermal conductivity, the degree of crystallization of the ceramics is low, resulting in low mechanical strength of the product, high water absorption, and poor wear resistance, which seriously affects the application of the product and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] By chemical composition: SiO 2 (32%), Al 2 o 3 (20%), CaO(10%), MgO(10%), Fe 2 o 3 +FeO(10%), Na 2 O+K 2 O+Li 2 O (10%), select waste minerals, foaming agent, sintering modifier, mix and crush, and crystal nucleus agent TiO 2 (8%) mixing, through ball milling, pressure filtration, granulation, stale, put into refractory mould, spread and scrape flat, through high temperature sintering, sintering maximum temperature is 1110-1130 ℃, holding time 30 minutes; ℃ kiln for nucleation treatment, cooling rate 500 ℃ / hour, nucleation temperature 600-630 ℃, heat preservation for 40 minutes; quickly heat up to 720-750 ℃ ​​for crystallization treatment, heating rate 500 ℃ / hour, heat preservation 50 minutes , cooled again to 450-550°C, with a cooling rate of 200°C / hour, and finally cooled with the furnace to produce a light-weight and high-strength microcrystalline ceramic insulation board. Compared with vitrified ceramic plates with the same density, the average particle ...

Embodiment 2

[0016] By chemical composition: SiO 2 (56%), Al 2 o 3 (10%), CaO(8%), MgO(5%), Fe 2 o 3 +FeO(6%), Na 2 O+K 2 O+Li 2 O (10%), select waste minerals, foaming agent, sintering modifier mixed crushing, and crystal nucleus agent CaF 2 (5%) mixing, through ball milling, pressure filtration, granulation, stale, put into refractory mold and spread and scrape flat, through high temperature sintering, the sintering maximum temperature is 1140-1180 ℃, holding time is 30 minutes; quickly transfer to 630-660 ℃ kiln for nucleation treatment, the cooling rate is 550°C / hour, the nucleation temperature is 640-670°C, and the heat preservation is 60 minutes; the temperature is rapidly raised to 750-780°C for crystallization treatment, the heating rate is 550°C / hour, and the crystallization temperature 750-780°C, keep warm for 60 minutes, cool down to 450-550°C again, the cooling rate is 300°C / hour, and finally cool with the furnace to make a light-weight and high-strength microcrystalline...

Embodiment 3

[0018] By chemical composition: SiO 2 (60%), Al 2 o 3 (18%), CaO(5%), MgO(3%), Fe 2 o 3 +FeO(6%), Na 2 O+K 2 O+Li 2 O (6%), select waste minerals, foaming agent, sintering modifier, mix and crush, and crystal nucleus agent TiO 2 (1.5%)+ZrO 2 (2%) mixing, through ball milling, pressure filtration, granulation, stale, put into refractory mold to cover and scrape flat, through high temperature sintering, the sintering maximum temperature is 1200-1250 ℃, holding time 25 minutes; quickly transfer to 620-650 ℃ kiln for nucleation treatment, the cooling rate is 450°C / hour, the nucleation temperature is 620-650°C, and the heat preservation is 50 minutes; the temperature is rapidly raised to 740-760°C for crystallization treatment, the heating rate is 600°C / hour, and the crystallization temperature 740-760°C, heat preservation for 45 minutes, cooling to 450-550°C again, cooling rate 400°C / hour, and finally cooling with the furnace to produce a light-weight and high-strength mic...

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Abstract

The invention discloses a lightweight high-strength microcrystal ceramic insulation board. The lightweight high-strength microcrystal ceramic insulation board comprises the following chemical components in percentage by weight: 30 to 75 percent of silicon dioxide (SiO2), 5 to 20 percent of aluminium oxide (Al2O3), 1 to 20 percent of calcium oxide (CaO), 1 to 15 percent of magnesium oxide (MgO), 1to 10 percent of ferric oxide and ferrous oxide (Fe2O3+FeO), 1 to 10 percent of sodium oxide, potassium oxide and lithium oxide (Na2O+K2O+Li2O) and 1 to 8 percent of nucleating agent. The lightweighthigh-strength microcrystal ceramic insulation board is prepared by the following steps of: mixing and crushing waste minerals, a foaming agent and a sintering modifier; mixing the crushed mixture with the nucleating agent; after ball-milling, filter-pressing, pelleting and staling the mixture, directly paving the powder in a fire-resistant mould fully, scraping the mould smoothly and allowing themould to enter a kiln; and after performing high-temperature sintering, quick cooling, nucleating treatment, quick heating and crystallization, cooling again and then annealing to prepare the product. The lightweight high-strength microcrystal ceramic insulation board has the advantages that: the average grain diameter is between 0.5 and 5 mu m; and crystal grains are dense and uniformly distributed and develop well.

Description

technical field [0001] The invention relates to the technical field of building thermal insulation materials, in particular to a lightweight high-strength microcrystalline ceramic thermal insulation board and a preparation method thereof. Background technique [0002] At present, judging from the practice process of my country's implementation of energy-saving building policies for many years, while achieving significant economic and social benefits, it has also exposed very worrying problems, the most prominent of which is energy-saving wall materials. Organic exterior wall insulation materials represented by polystyrene board and polyurethane directly endanger human life safety and social stability because of their flammability, aging and toxicity. Compared with organic insulation materials, inorganic wall insulation materials have outstanding advantages in fire resistance, corrosion resistance, stability, energy saving and environmental protection, and are gradually being...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/06
Inventor 张士华陈光崔崇赖建中彭东文石晓琴
Owner NANJING UNIV OF SCI & TECH
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