Explanation

alloy powder based on mirror, cobalt, iron and chromium, boron and silicon, which can automatically form slag to protect alloy from oxidation, has high wetting ability and high hardness. The thermal spraying (welding) hardness of NiCrBSi is HRC55-60, the melting point is about 1000 ℃, and the thermal expansion coefficient is close to that of stainless steel. The spraying layer of thermal spraying on the workpiece surface is melted by flame re burning, which can form a metallurgical bonding layer with the base metal. The bonding force between spraying (referring to non flame remelting) and the base metal is 50MPa, while spraying welding (referring to flame remelting) is 200-300MPa. The thickness of the spray (welding) layer is about 1mm, and it is easy to fall off if it is too thick. Therefore, it is closely connected with thermal spraying (welding) technology. self-fluxing alloy also relies on thermal spraying (welding) technology and base metal (workpiece) fusion welding to form a whole, which truly reflects the characteristics of alloy. Chromium in self-fluxing alloy generates chromium carbide and chromium boride hard spots are dissolved in nickel matrix. Boron and silicon can reduce the melting point of alloy and play a role in slag forming. After smelting, powder is made by atomizing with water (or gas), which is called powder. According to composition, it can be divided into three major categories: nickel based, iron based and cobalt based. Among them, nickel based powder is the most widely used, widely used in thermal spraying (welding), as wear-resistant protection of workpieces and repair of easily worn parts.

Classification