Ultra-hard titanium nitride coating
What color is titanium nitride?
Titanium Nitride Coated Tool
Titanium nitride is a compound whose molecular formula is TiN. TiN powder is generally yellowish brown, ultrafine TiN powder is black, and TiN crystals are golden yellow. TiN has a melting point of 2950°C and a Mohs hardness of 8-9. The thermal shock resistance of TiN is higher than that of most transition metal nitrides, but its density is lower than that of most metal nitrides.
Is titanium nitride toxic?
Therefore, the evidence obtained in this study is that the test material is non-toxic, non-irritating, non-hemolytic and biocompatible.
What is the role of titanium coating?
Titanium nitride (TiN) coating is wear-resistant, inert and reduces friction. Using it for cutting tools, punches, molds, and injection mold components can increase the tool life by two to ten times or more than uncoated tools.
The reform of tool materials is often a pioneer in the machining industry. With the development of modern industry and science and technology, cutting tool materials have grown from carbon tool steel, high-speed steel, cemented carbide steel to composite materials. progress. However, all kinds of tools currently used generally have short service life and affect production efficiency. Most of them are caused by insufficient surface hardness and wear resistance.
Later, it was discovered that coating a layer of titanium nitride super hard film on the surface of high-speed steel or hard alloy steel tools has a peculiar effect on improving the performance of the tools. Titanium nitride is a fairly stable compound with excellent corrosion resistance and oxidation resistance. It has an attractive golden color, but its main application is not for decoration.
The hardness value of the titanium nitride coating is above 2500 Vickers hardness (HV). If the tool is coated with a titanium nitride coating of 3 to 5 microns, the tool can have higher wear resistance and heat resistance , Greatly improve tool life and cutting efficiency. For example, the life of gear hobs can be prolonged by 3 to 4 times after being coated with titanium nitride, so the cutting speed can be increased when cutting gears, thereby reducing processing time and cost.
Study on Surface Modification of Biomedical Titanium Alloys to Improve Wear Resistance
Titanium and its alloys are the most commonly used medical implant metal materials in orthopedics and dental applications because of their low density, high strength, non-toxicity and excellent corrosion resistance. Compared with traditional stainless steel and cobalt-based alloys, titanium alloys have a lower elastic modulus, and the low elastic modulus has been proven to reduce the stress shielding effect, thereby better inducing and promoting osseointegration. These advantages make it It is more suitable for clinical medical applications.
However, titanium and its alloys cannot meet the clinical requirements of biomedical implants. Long-term clinical studies have found that titanium implants have poor wear resistance. The wear debris generated by the friction of titanium implants can cause inflammation and have toxic effects on the human body. .
In order to improve the biological and tribological properties of titanium alloys, the introduction of surface modification technology to improve the biological activity, wear resistance and antibacterial properties of titanium and titanium alloys is to improve existing conventional biological materials to meet current and evolving clinical needs The more economical and effective method.
At present, a variety of physical and chemical methods have been used to improve the wear performance of the titanium alloy surface, by depositing a ceramic coating with excellent wear resistance on the titanium surface to improve its wear and corrosion performance. Commonly used wear-resistant coatings include diamond-like carbon (DLC) and titanium nitride (TiN) coatings.
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