Porous membrane with TiN coating and preparation method thereof

A porous film and coating technology, which is applied in the field of porous materials and their preparation, porous Ti and its preparation, can solve the problem that the surface wear resistance, corrosion resistance coating and TiN coating cannot achieve continuous, The problems of dense structure and insignificant effect of corrosion resistance can achieve the effect of low cost of raw materials, good controllability of product quality and narrow pore size distribution.

Active Publication Date: 2012-10-10
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

There are many nitriding methods for titanium and titanium alloys, mainly including gas nitriding, glow ion nitriding, laser gas nitriding, etc. TiN coating can be formed on the surface of titanium and titanium alloys, but many existing production methods often only Form a coating on the surface, but it is impossible to form a coating on the surface of the Ti skeleton with a porous structure, and even the TiN coating formed on the surface often cannot achieve a continuous and dense structure, and the effect of improving corrosion resistance is not obvious
[0005] Therefore, the existing method has outstanding limitations: one is that there is no wear resistance and corrosion resistance coating on the porous Ti hole surface; the other is that the nitriding time is long and the nitriding cost is high; the third is that the equipment investment is large

Method used

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  • Porous membrane with TiN coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The porous membrane with TiN coating of the present embodiment is prepared by the following method:

[0020] Step 1: Take Ti powder and TiH 2 Powder, Ti, TiH 2 The powder purity is greater than 99.6%, and the average size is 40, 33 μm, respectively.

[0021] The second step: powder weighing and mixing

[0022] Raw material according to 1wt% TiH 2 powder, and the rest is weighed as Ti powder. Put the weighed powder into a ball mill and mix it for 4 hours, take it out, pour it into a mold, and press it into a square sheet compact of 30×30×5mm under a pressure of 120MP, with a relative density of about 63%.

[0023] Step Three: Warm Up

[0024] Slowly heat the compact in a vacuum furnace to 300°C for preheating, and keep it warm for 0.5 hours.

[0025] Step 4: Nitrogen plasma beam scanning heating process preparation

[0026] Turn on the power, water, and gas switches of the plasma equipment, first turn on the high-frequency arc, adjust and set the process parameter...

Embodiment 2

[0036] The difference with Example 1 is that the raw material is according to 2wt% TiH 2 powder, the rest is Ti powder, the plasma beam current is 90A, the plasma beam scanning speed is 3mm / s, the average hole size of the porous membrane is 46μm, and the porosity of the porous membrane is finally 45%.

[0037]The main process parameters and related properties of the samples are shown in Table 2.

[0038] Table 2.

[0039] Ti H 2 (wt%)

Embodiment 3

[0041] The difference with Example 1 is that the raw material is according to 3wt% TiH 2 powder, and the rest is Ti powder, the compaction pressure is 80MPa, the compaction relative density is 54%, the plasma beam current is 100A, and the plasma beam nitrogen flow rate is 0.3m 3 / h, the plasma beam scanning speed is 2mm / s, the average size of pores in the porous membrane is 53μm, and the porosity of the porous membrane is 47%. The main process parameters and related properties of the samples are shown in Table 3.

[0042] table 3.

[0043] TiH 2 (wt%)

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Abstract

A porous membrane with a TiN coating. A nitrogen plasma beam is utilized to carry out scanning heating azotizing treatment on a lamellar compact prepared from Ti and TiH2, so as to form a pore-like structure and obtain compact and continuous TiN coating and Ti2N coating surrounding a Ti skeleton matrix on the Ti skeleton among the pores. The method of the invention completes acquisition of the porous material and formation of the coating in one step, and has advantages of large porosity range of the film, short preparation process, high efficiency and high yield. The porous Ti membrane with TiN coatings on surfaces of the pores has uniform and dense tissue, is in good metallurgical combination with the matrix, and has micro hardness of 1270-1430 HV. The porous membrane has similar shape and size as a blank and good similarity. Besides, the membrane with good abrasion resistance and corrosion resistance can be used as a catalyst carrier and a filtering body in the industries of catalysis, environment purification and medicine, and has wide application prospects.

Description

technical field [0001] The invention relates to a porous material and a preparation process thereof, in particular to a porous Ti with a TiN wear-resistant layer on the hole surface and a preparation method thereof, belonging to the field of material synthesis and processing. Background technique [0002] Porous materials have a series of special functions due to their porous structure, and play an extremely important role in the fields of automobile, energy, medical treatment, environmental protection and petrochemical industry. Such as: using its high specific strength ultra-light components, using its high damping muffler, using its anti-flow effect to prevent explosion fire extinguishing devices, using its porous filtration and separation to purify liquids and gases, and using its porous structure to strengthen Heat transfer elements and wicks. The excellent performance and practical needs have prompted people to continuously explore and develop porous materials and new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C14/00C23C8/36B01D39/20B22F3/16
Inventor 崔洪芝曹丽丽孙金全曾荣昌王灿明
Owner SHANDONG UNIV OF SCI & TECH
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