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Nitride-ceramic high-temperature wear-resistant coating and preparing method thereof

A nitride ceramic, high-temperature wear-resistant technology, applied in the field of ceramic wave-transmitting materials, can solve the problems affecting the stability of the dielectric properties of wave-transmitting materials, reducing the mechanical properties of materials, and poor rain erosion resistance, etc., to achieve easy implementation, Good matching, improve the effect of ablation resistance and erosion resistance

Inactive Publication Date: 2016-11-16
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high porosity of porous silicon nitride-based ceramic materials will reduce the mechanical properties of the material, easily absorb moisture, and deteriorate the rain erosion resistance, which will seriously affect the stability of the dielectric properties of the wave-transmitting material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Weigh 42.18g of lithium carbonate, 89.14g of aluminum hydroxide and 68.68g of quartz powder, dry mix them evenly, pour them into a high-temperature resistant alumina crucible, and melt them in a muffle furnace at 1600°C until they are completely melted Afterwards, rapid cooling and water quenching are carried out, and finally the water-quenched material is dried and pulverized, passed through a 35-mesh analytical sieve, and set aside.

[0037] (2) Put the pulverized material in (1) into a sagger in advance, heat-treat at 1200°C, grind, pass through a 35-mesh analytical sieve, and set aside.

[0038] Weigh 40g of pretreated component A, 35g of potassium feldspar, 10g of Suzhou soil, 12g of quartz powder, 3g of calcium carbonate, 200g of low-wear silicon nitride grinding balls and 80ml of carboxymethylcellulose aqueous solution with a concentration of 0.5%. , ball milled for 30 minutes in a quick grinding jar, and then the powder was removed from the mill and defoamed...

Embodiment 2

[0044] (1) Weigh 39.25g of lithium carbonate, 82.95g of aluminum hydroxide, and 127.83g of fused silica powder, dry mix them evenly, pour them into a high-temperature-resistant alumina crucible, and melt them in a muffle furnace at 1600°C until they are completely After melting, carry out rapid cooling and water quenching, then dry and pulverize the water quenched material, pass through a 35-mesh analytical sieve, and set aside;

[0045] (2) Heat-treat component A in (1) at 900°C in advance, pulverize, pass through a 35-mesh analytical sieve, and set aside;

[0046] Weigh pretreated component A60g, potassium feldspar 20g, Suzhou soil 5g, quartz powder 10g, calcium carbonate 5g, low-wear silicon nitride grinding ball 300g and concentration of 1% polyvinyl alcohol aqueous solution 100ml, in Carry out ball milling in the quick grinding tank for 30 minutes, after milling and defoaming, paint slurry is obtained;

[0047] (3) Coating: Coat the slurry on the surface of low-density n...

Embodiment 3

[0052] (1) Weigh 46g of lithium carbonate, 87.5g of aluminum hydroxide and 116.5g of fused silica powder, dry mix them evenly, pour them into a high-temperature-resistant alumina crucible, and melt them in a muffle furnace at 1600°C until they are cooled to Crush after room temperature, pass through a 35-mesh analytical sieve, and set aside;

[0053] (2) Heat-treat component A in (1) at 1300°C in advance, pulverize, pass through a 35-mesh analytical sieve, and set aside;

[0054] Weigh 32g of pretreated component A, 30g of anorthite, 3g of Suzhou soil, 30g of quartz powder, 5g of calcium carbonate, 400g of silicon nitride grinding balls with low wear and 100ml of polyvinyl alcohol aqueous solution with a concentration of 1.2%. Carry out ball milling in the quick grinding tank for 30 minutes, after milling and defoaming, paint slurry is obtained;

[0055] (3) Coating: Coat the slurry on the surface of low-density nitride ceramics by spraying process, and perform low-temperatur...

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Abstract

The invention belongs to the field of ceramic wave-transmitting materials, and in particular relates to a nitride ceramic high-temperature wear-resistant coating and a preparation method thereof. It is made of material, grinding balls and organic binder solution; the material includes the following components: component A, feldspar, quartz and calcium carbonate; component A includes lithium carbonate, aluminum hydroxide and quartz powder. The coating has a good combination with the substrate, and can be precisely cold processed. The internal structure of the coating is uniform and dense without pores, the surface has no cracks, no water absorption, and the coating has high hardness. After coating, the dielectric constant of the composite material has basically no change compared with that before coating, and the dielectric loss has been reduced to a minimum of 9×10 ‑4 . The invention improves the moisture absorption of the porous silicon nitride, improves the ablation resistance and erosion resistance of the material, and enhances the environmental adaptability of the porous low-density nitride ceramics. The invention also provides a preparation method thereof, which has the advantages of scientific rationality, easy implementation, short production cycle and low investment cost.

Description

technical field [0001] The invention belongs to the field of ceramic wave-transmitting materials, and in particular relates to a nitride ceramic high-temperature wear-resistant coating and a preparation method thereof. Background technique [0002] With the development of science and technology, aviation, aerospace and other fields require wave-transparent materials to have excellent comprehensive performance. Silicon nitride-based materials have strong covalent bonds and low thermal expansion coefficients (2.35×10 -6 / K, maintain good thermal shock resistance under flight conditions of Mach 6-7), good chemical stability, anti-oxidation temperature up to 1400 ° C, and use temperature up to 1800 ° C in neutral or reducing atmosphere, becoming A new hotspot in radome materials. In order to realize the use in a certain wide frequency range, the radome material is mostly designed as a porous low-density structure. In addition to the advantages of silicon nitride-based ceramic...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/009C04B41/5031
Inventor 翟萍王洪升朱保鑫栾强韦其红廖荣程之强张燕
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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