Method for preparing low-temperature lead-free near zero expansion microcrystalline ceramic coating

A microcrystalline ceramics, near-zero expansion technology, applied in functional ceramics and special fields, can solve the problems of great influence on wave transmission performance and low firing temperature, and achieve scientific and reasonable preparation methods, low-temperature use of linear expansion coefficient, and easy implementation. Effect

Active Publication Date: 2011-03-02
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead oxide has been used as a low-temperature main flux in ceramic glazes for a long time. Lead-containing glazes have excellent properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] (1) Preparation of LBA-1:

[0034] 1#. The raw materials used are lithium carbonate, boric acid, aluminum hydroxide, quartz and magnesium oxide, which are dry-mixed evenly according to the weight ratio of 10:75:5:6:4, and melted in a muffle furnace at 900-1050°C. Keep warm for 1 hour, water quench, ball mill and pulverize, and set aside;

[0035] 2#. The raw materials used are lithium carbonate, boric acid, aluminum hydroxide, quartz and magnesium oxide, which are dry-mixed evenly according to the weight ratio of 13:72:3:7:5, and melted in a muffle furnace at 850-1100°C. Keep warm for 0.5-2h, water quench, ball mill and pulverize, and set aside;

[0036] 3#. The raw materials used are lithium carbonate, boric acid, aluminum hydroxide, quartz and magnesium oxide, which are dry-mixed evenly according to the weight ratio of 11:80:2:5:2, and melted in a muffle furnace at 850-1100°C. Keep warm for 0.5-2h, water quench, ball mill and pulverize, and set aside;

[0037] (2) ...

Embodiment 1

[0060] Weigh 60g2#ABA-1, 48g1#LBA-1, 12g1#ZB-1, 12gZW-2 and dry mix them evenly, put them in an alumina crucible, put them in a muffle furnace for melting at 1000-1100℃, keep warm 0.6h. The molten glass is poured on a preheated stainless steel plate, heated to 600°C to 840°C after the electric furnace cools down, kept for 2 hours for microcrystallization treatment, and then naturally cooled to room temperature.

[0061] The above-mentioned composite ceramic powder was ball milled for 24 hours and then pulverized. That is to say, 50 grams of powder was added to 38.5 milliliters of distilled water and 31.5 milliliters of methylcellulose solution, and 100 grams of zirconia balls were used as grinding media. After ball milling, it is made into ceramic slurry, coated or sprayed on the surface of the substrate, and kept at 620°C for 1 hour to melt to form a composite inorganic microcrystalline ceramic coating. Its expansion coefficient is α=0.2068×10 -6 / °C.

Embodiment 2

[0063] Weigh 46g1#BL168 and 54g3#ABA-2 and dry mix them evenly, put them in an alumina crucible, put them in a muffle furnace for melting at 1100-1200°C, and keep them warm for 1h. The molten glass is poured on a preheated stainless steel plate, heated to 600°C to 840°C after the electric furnace cools down, kept for 2 hours for microcrystallization treatment, and then naturally cooled to room temperature.

[0064] The above-mentioned composite ceramic powder was ball milled for 24 hours and then pulverized. That is to say, 50 grams of powder was added to 38.5 milliliters of distilled water and 31.5 milliliters of methylcellulose solution, and 100 grams of zirconia balls were used as grinding media. After ball milling, it is made into ceramic slurry, coated or sprayed on the surface of the substrate, and kept at 620°C for 1 hour to melt to form a composite inorganic microcrystalline ceramic coating. Its expansion coefficient is α=0.1192×10 -6 / °C.

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Abstract

The invention relates to a method for preparing a low-temperature lead-free near zero expansion microcrystalline ceramic coating, belonging to the technical field of specific and functional ceramic. The method comprises the following steps: uniformly performing dry mixing on one or two of low temperature clinker 2, spodumene melt or eucryptite melt in an arbitrary proportion, one or two or three of low temperature clinker I, zirconium tungstate powder, an additive I or an additive 2 in an arbitrary proportion and a nucleating agent; melting the mixture in a Muffle furnace, and preserving the temperature of between 950 and 1,200 DEG C for 0.5 to 1h; pouring the molten glass fluid on a preheated stainless steel plate; continuously heating the molten glass fluid to 750 DEG C in the Muffle furnace at the temperature of between 560 and 650 DEG C, and preserving the temperature for 1 to 4h; naturally cooling the glass fluid to room temperature, crushing to obtain composite ceramic powder; adding a plasticizing agent and deionized water into the composite ceramic powder to prepare slurry; and coating the slurry on the surface of a matrix to sinter at the temperature of between 600 and 650 DEG C to obtain a composite inorganic microcrystalline ceramic coating. The method is scientific and reasonable, simple and practicable, and is convenient to implement; and the prepared coating material is water proof, is lead free, can be used at low temperature, and has near zero linear expansion coefficient.

Description

technical field [0001] The invention relates to a method for preparing a low-temperature, lead-free, and near-zero-expansion microcrystalline ceramic coating, which belongs to the technical field of special and functional ceramics. Background technique [0002] The continuous development of aerospace technology has also put forward higher and higher requirements for the performance of wave-transparent materials. Due to their inherent shortcomings (such as low toughness and high brittleness), single-component ceramic materials can no longer meet the conditions of use. Therefore, Research on fiber fabric composites has become an inevitable trend. At present, the fibers used as reinforcing fabrics mainly include quartz fibers, alumina fibers, and boron nitride fibers. Their composite materials have been widely used in many aviation and aerospace engineering components such as nose cones, heat shields, antenna windows, and radomes. use. [0003] Quartz fiber-reinforced silica-...

Claims

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Application Information

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IPC IPC(8): C03C10/00
Inventor 翟萍陈达谦李伶韦其红王重海刘燕燕高芳王洪升
Owner ZHONGCAI HIGH NEW MATERIAL
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