A method for laser cracking polysilazane precursors to prepare ceramic coatings

A technology of polysilazane and ceramicization, which is applied in the direction of coating, metal material coating process, solid-state chemical plating, etc., which can solve the problems of increased difficulty in finished product preparation, difficult control of laser scanning conditions, and increased difficulty in PDC control. , to achieve the effects of designable and adjustable structure and performance, abundant precursors, and concentrated energy

Active Publication Date: 2018-09-14
ACADEMY OF ARMORED FORCES ENG PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the use of laser scanning for PDC method. The reason is that it is difficult to control the conditions of laser scanning, which usually increases the difficulty of PDC control, which makes the preparation of the final product more difficult.

Method used

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  • A method for laser cracking polysilazane precursors to prepare ceramic coatings
  • A method for laser cracking polysilazane precursors to prepare ceramic coatings
  • A method for laser cracking polysilazane precursors to prepare ceramic coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The precursor component of this example is PSZ1 (Polysilazane 1), a low-viscosity liquid organic polysilazane polymer with an average molecular weight of 600-1000 and composed of repeating Si-N units. The laser is a DLS-3000C continuous high-power semiconductor laser , Laser wavelength 980nm, maximum output power 3KW, spot size 14mm×2.5mm, working distance 310±10mm.

[0036] The preparation method of above-mentioned ceramic coating is made up of the following steps:

[0037] step one:

[0038] Sandblast the substrate (a 45 steel sample block with a length of 20mm, a width of 20mm, and a height of 5mm), then clean it with ethanol and acetone, and dry it for later use.

[0039] Step two:

[0040] Coat 30% xylene solution of organic polymer ceramic precursor PSZ1 on the surface of the substrate, remove the solvent by vacuuming with an oil pump, and cure in vacuum at a rate of 5°C / min from room temperature (18°C) to 130°C to form a thickness of about 1mm prefabricated lay...

Embodiment 2

[0044] The precursor component of this example is PSZ2 (Polysilazane2), a low-viscosity liquid organic polysilazane polymer with an average molecular weight of 500-900 and composed of repeating Si-N units. The laser is a DLS-3000C continuous high-power semiconductor laser , The laser wavelength is 980nm, the maximum output power is 3KW, the spot size is 14mm×2.5mm, and the working distance is 310mm±10mm.

[0045] The preparation method of above-mentioned ceramic coating is made up of the following steps:

[0046] step one:

[0047] Sandblast the substrate (a 45 steel sample block with a length of 20mm, a width of 20mm, and a height of 5mm), then clean it with ethanol and acetone, and dry it for later use.

[0048] Step two:

[0049] Coat 50% xylene solution of organic polymer ceramic precursor PSZ2 on the surface of the substrate, remove the solvent by vacuuming with an oil pump, and solidify in a vacuum at a rate of 5°C / min from room temperature (18°C) to 130°C to form a la...

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PUM

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Abstract

The invention provides a method for preparing a ceramic coating through laser pyrolysis of a polysilazane precursor and a product obtained according to the method. According to the method, after being pretreated, a substrate is coated with or sprayed with the polysilazane organic polymer ceramic precursor; and then a coating is subjected to laser scanning under the protection of inert gas, ceramic conversion is achieved, and the ceramic coating is prepared and obtained. Compared with a traditional high-temperature sintering method, according to the method for preparing the ceramic coating, sintering is not needed, and thus energy consumption is reduced; laser energy is concentrated, the heat affected zone is small, the composition of a matrix phase is not affected, laser pyrolysis ceramic reaction is rapid, and accordingly the processing efficiency is high. The laser flexibility is good, the processing mode is flexible, and the obtained ceramic coating has high hardness, corrosion resistance and thermal shock resistance.

Description

technical field [0001] The present invention relates to the field of applied chemistry, in particular to the field of coating preparation, more specifically to a ceramic coating and a preparation method thereof, and more specifically to the preparation of ceramic coatings by using semiconductor lasers to crack polynitrosilane precursor polymers The method of layering and the products obtained by this method. Background technique [0002] With the continuous development of mechanical equipment in the direction of high speed, heavy load, integration, high precision, and long life, the working environment of its friction parts is becoming increasingly harsh, and pure metal materials are difficult to meet the requirements. Preparing high-performance coating materials on the surface of metal parts and endowing them with special functions has become an effective way to solve the problem of reliable service of metal parts under harsh working conditions. [0003] Ceramic coatings h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C20/08
CPCC23C20/08
Inventor 乔玉林薛胤昌刘军臧艳
Owner ACADEMY OF ARMORED FORCES ENG PLA
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