Technical Topics-第8页-Changsha Langfeng Metallic Material Co., Ltd.

Chromium carbide powder applications
Chromium carbide is used as a thermal spray material for protecting the underlying metal surface, and as an additive to corrosion-resistant and wear-resistant materials. It is used as a fine crystal phase in other sintered carbides, where, like the vanadium carbide, it inhibits growth of submicrometre grains during pressing and sintering.
Ceramic Matrix Composites’s Prospects
Advantages and Development of Thermal Spraying Technology
China's thermal spraying technology is from the fifties began, when Wu Jianchun and Zhang Guobao in Shanghai set up the first domestic specialized spraying plant, the development of oxygen acetylene flame spray and spray device, and carry out metal spraying business. China's thermal spraying technology started earlier, 50 years on the development of the wire arc spraying; 60 years, some military departments began to study plasma spraying, plasma arc flame temperature is high, similar to the spraying particles flying fast, coating bonding strength High (40 ~ 80MPa), porosity less than 5%, widely used in China's military sector; 70 years appeared in the variety and model more complete spraying equipment and materials, but in general progress is slow, but only in recent years Get a faster development. In particular, the former State Economic Commission will be thermal spraying as a national key promotional projects, the development of faster and achieved significant economic benefits. October 21-21, 1981 by the State Economic Commission, the State Science and Technology Commission in Beijing held the first national thermal spraying conference, announced by the State Economic Commission under the leadership of the establishment of the "National Thermal Spray Collaborative Group", anchored in Beijing Mining and Metallurgy...
The surface quality of the tool should be improved before coating
The surface quality of the tool should be improved before coating In order to improve the quality of cutting tools and die, often in the tool and die coated with so-called hard coating. This coating is applied using a physical vapor deposition process (PVD) or by chemical vapor deposition (CVD). With the help of hard coating can improve the durability of the tool or to maximize the cutting speed of the tool. The quality of the coating depends to a large extent on the surface quality of the tool, removing the burr condition and the sharpness of the tool. Smooth surface reduces the effect of traces The more smooth the surface of the tool, the flow of chips is more smooth, the lower the temperature rise on the chip. In this way, the tool can also use a higher cutting speed, and significantly improve the durability of the tool. The smooth surface of the tool also reduces the risk of welding with the material to be processed. For tap and squeeze tapes. The required cutting force can be significantly reduced by 40%. In general, the coating needs to improve the surface roughness characteristic values, so the table is required to...
Metal powder flame spraying (welding) spray welding process typical surface spray characteristics
(3) In order to prevent the edge of the coating tilt, before spraying can be grooved at the edge of the workpiece, and by sand blasting can reduce the stress. 3, the mouth surface spray process points: ⑴ spraying should be sprayed before the cylindrical part of the spray after the plane part. ⑵ spray gun powder spray direction along the circumference of the workpiece into a 45-degree angle injection is good, this may make the powder deposition rate is low, but it can spray a clear edge of the spray operation Note that the gun can not be sprayed perpendicular to the corner, This will cause the corners of the coating to be loose or sandwiched. ⑶ spraying edge such as burr, Alice, should be promptly removed and then spray. 4, the local serious damage parts of the spraying process points: ⑴ the local damage at the polished clean, first spray or repair with other methods, and then spray all the plane. ⑵ for the deeper, wider local defects can be seen, can also be used to fill the welding, and then fully sprayed. ⑶ on the local defects with cracks must first find the crack from the end,...
Cutting the surface defects of the cutting edge reduces stability
Cutting the surface defects of the cutting edge reduces stability The condition of the cutting edge is the most important criterion for tool processing stability, workpiece work consistency and the finished surface quality to be achieved. Disadvantages: Because the cement is relatively brittle, the carbide cutting edges are prone to rupture due to the large compressive stress – especially when cutting both hard and tough materials, such as cutting high quality alloy steel. Such rupture may be very small, but relatively still relatively large.With the passage of time, the cutting edge itself is gradually worn and rounded. But can not be controlled. At this time the stability of the tool processing dropped sharply. Because the coating has been destroyed. Likewise, the quality of the finished surface to be achieved is severely damaged. Through the use of Otec polishing process to cut the cutting edge and get a stable and uniform blade blunt round. Due to additional to improve the surface quality of the cutting edge to get the effect: · Tool durability increased by up to 500%. · Surface quality – The cutting edge has a uniform and lower Ra value. · Reliable cutting process is possible because the tool...

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