Salt-bath niobiumizing agent for surface of metallic titanium and niobiumizing method thereof

A metal titanium and salt bath technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of poor flexibility, high cost, poor industrial practicability, etc., and achieve the effect of good interface bonding

Active Publication Date: 2016-11-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost, poor flexibility, and poor industrial applicability in the existing niobium infiltration technology on the surface of titanium metal, and to invent a salt bath niobium infiltration agent on the surface of titanium metal, and at the same time provide its infiltration Niobium method, which can not only obtain a niobium infiltrated layer with excellent performance, but also has the characteristics of simple operation, easy realization, low requirements on equipment, etc., and has excellent economical efficiency

Method used

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  • Salt-bath niobiumizing agent for surface of metallic titanium and niobiumizing method thereof
  • Salt-bath niobiumizing agent for surface of metallic titanium and niobiumizing method thereof
  • Salt-bath niobiumizing agent for surface of metallic titanium and niobiumizing method thereof

Examples

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Embodiment 1

[0028] A method for infiltrating niobium in a salt bath on the surface of metal titanium, which comprises preparation of an infiltrating agent, pretreatment of the workpiece surface, pretreatment of the infiltrating agent, niobium infiltrating treatment and workpiece cleaning, wherein:

[0029] The preparation of osmotic agent refers to 840 grams of anhydrous borax (Na 2 B 4 o 7 ), 100 grams of niobium oxide (Nb 2 o 5 ) and 60 grams of silicon carbide (SiC) were mixed evenly and placed in an oven at 120°C for 40 minutes to obtain the required salt bath niobium infiltrating agent for the surface of titanium metal for use. The silicon carbide is commercially available green and pure silicon carbide with a particle size of 150-200 The purity of niobium oxide is at least 99.5%;

[0030] The surface pretreatment of the workpiece is to wire-cut the TC4 titanium alloy bar into 10mm×12mm×3mm profiles for later use. After degreasing and cleaning with deionized water, the surface o...

Embodiment 2

[0036] Method is basically identical with embodiment 1, and difference is that the niobium infiltrating agent formula that adopts is by 840 gram Na 2 B 4 o 7 (84%), 100 g Nb 2 o 5 (10%), 60 grams of SiC (6%).

[0037] Test after taking out the sample. The thickness of the infiltrated layer is 1.6 μm ( figure 2 ); the surface hardness of the infiltrated niobium layer is 1155HV, which is about 3.5 times the hardness of the matrix.

Embodiment 3

[0039] The method is basically the same as in Example 1, except that the temperature of niobium infiltration in the niobium infiltration method adopted is 1000°C.

[0040] After taking out the sample, it was tested that the surface hardness of the niobium infiltrated layer was 1071.8HV, about 3.2 times the hardness of the matrix.

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Abstract

The invention discloses a salt-bath niobiumizing agent for the surface of metallic titanium and a niobiumizing method thereof. The salt-bath niobiumizing agent is characterized by consisting of borax anhydrous (Na2B4O7), niobium oxide (Nb2O5) and silicon carbide (SiC), wherein niobiumizing key parameters are that a niobiumizing temperature is 900 DEG C to 1050 DEG C, and a niobiumizing heat preservation time is 4h to 10h. Through the niobiumizing agent and the niobiumizing method, the layer thickness of a niobiumized layer successfully prepared on the surface of the metallic titanium is 1 to 15 microns; the element diffusion which is obvious and further gradient exists between the niobiumized layer and a matrix; the niobiumized layer is good in interface bonding; and the microhardness of a surface layer of the niobiumized layer is 734HV to 1190HV, and is approximately 2.2 to 3.6 times the hardness (approximate 330HV) of the matrix. The salt-bath niobiumizing agent for the surface of the metallic titanium and the niobiumizing method thereof are simple in operation method and excellent in economic performance, can be used for industrial production, and have quite wide application prospects in the fields of biomedical application and the like.

Description

technical field [0001] The invention relates to a chemical heat treatment technology, in particular to a niobium infiltrating agent and a niobium infiltrating method thereof, in particular to a niobium infiltrating agent and a niobium infiltrating method for a metal titanium surface salt bath. Background technique [0002] As biomedical materials, titanium and titanium alloys are widely used in hard tissue replacement, heart valves, vascular stents, tooth Roots and various orthopedic devices, etc. However, although its elastic modulus is lower than that of other biomedical materials, it is still much higher than that of human bone, and its hardness is low, its coefficient of friction is large, its surface wear resistance is poor, and its corrosion resistance needs to be further improved. Because Ti-Nb alloy has the advantages of ultra-low elastic modulus, corrosion resistance and good biocompatibility, and the infiltration of niobium has been proved to enhance the hardness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/24C23C10/02
CPCC23C10/02C23C10/24
Inventor 许晓静朱金鑫韩天宋振华何星华
Owner JIANGSU UNIV
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