A low-temperature multi-component nano-composite penetrating agent and surface treatment process to improve the wear resistance of burs

Abstract

The invention discloses a low-temperature multielement nano composite permeating agent capable of improving wear resistance of a machine needle and a surface treatment technology. The composite permeating agent is composed of a nano permeating agent, a nano reducing agent and a surface protection agent; the nano permeating agent is composed of V2O5 nano particles with the particle size ranging from 5 nm to 50 nm and Cr2O3 nano particles with the particle size ranging from 5 nm to 50 nm, and the weight proportion of the V2O5 nano particles to the Cr2O3 nano particles is 6.0-8.6:4.2-5.8; Si nano particles with the particle diameter ranging from 5 nm to 40 nm are selected in the nano reducing agent, and the adding weight of the nano reducing agent is 3.0 times to 4.5 times of the use amount of the nano permeating agent; and the surface protection agent is composed of magnesium carbonate, aluminum hydroxide and calcium hydroxide, wherein the particle size of each of the magnesium carbonate, the aluminum hydroxide and the calcium hydroxide ranges from 800 meshes to 1200 meshes, and the weight proportion of the magnesium carbonate to the aluminum hydroxide to the calcium hydroxide is 1.0:1.0:1.0. Through the technology treatment of the machine needle, the surface hardness can reach 2500 HV to 3000 HV, a permeating layer is in metallurgical bonding, the thickness ranges from 5 micrometers to 10 micrometers, the cutting efficiency of the machine needle is improved by more than 50%, and the needle breaking phenomenon is reduced.

Description

technical field [0001] The invention relates to the field of oral medical devices, in particular to a low-temperature multi-component nanocomposite penetrating agent and a surface treatment process for improving the wear resistance of burs. Background technique [0002] Dental handpiece burs, also known as dental drills, are used for drilling teeth. They are an essential and important tool for dentists in clinical treatment, and they are also one of the most important dental consumable instruments. The surface of the tooth is a layer of hard enamel, with a Mohs hardness of 6-7, so the bur can only grind the enamel efficiently if the surface hardness is high enough. The dental bur includes a needle head and a shank. The head can be made of hard alloy, such as tungsten carbide, or deposited nano-diamond to improve the wear resistance of the bur. [0003] At present, domestic dentists mostly use tungsten steel dental burs and emery burs, while foreign dentists mainly use high-...

AI Technical Summary

Problems solved by technology

In order to improve the wear resistance of the bur, the blade head is made of tungsten carbide hard alloy and assembled together by welding, but the bur has the following disadvantages: it is difficult to guarantee the concentricity of the needle body and the cemented carbide blade head during welding, Therefore, it is easy to break or break when using

The linear expansion coefficient of stainless steel is 12.3X10 -6 / °C, the expansion coefficients of the two materials differ greatly, resulting in that when the needle and the handle are welded together, the internal stress after welding is very large, cracks are prone to appear, and the bending strength of the weld is not high

Therefore, welding burs have problems of poor processing concentricity and welding fracture

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