What is sls? The recruitment requirement is "at least 2 years working experience in SLS".

Selective laser sintering of powder materials

brief introduction

Another definition of SLS: selective laser sintering of powder materials/selective laser sintering/powder sintering 1986. The idea of selective laser sintering ring (SLS) was put forward by C. Deckard, a graduate student at the University of Texas, and was successfully developed in 1989. Later, DTM company was established and a commercial molding machine based on SLS was developed in 1992. DTM Company was acquired by 3D Company. SLS process is made of powder material. Spreading material powder on the upper surface of the molded part and scraping it flat; Scanning the section of the parts on the newly laid layer with high-intensity CO2 laser; The material powder is sintered together under the irradiation of high-intensity laser to obtain the cross section of the part, which is connected with the part formed below; When sintering a cross section, a new layer of powder material is laid and the next cross section is selectively sintered.

Characteristics of laser selective sintering

(1) A variety of materials can be used: any powder with reduced viscosity when heated can be made into any shape by materials or various coating particles containing binders; In particular, metal parts can be manufactured. This makes SLS process attractive. (2) The manufacturing process is relatively simple: prototypes, molds, three-dimensional buildings or components and tools with complex shapes can be directly produced, which can be widely adapted to design and changes; (3) High accuracy: It depends on the type and granularity of the materials used, the geometric shape and complexity of the product. Generally, the tolerance of +(0.05-2.5) mm can be achieved within the whole building. When the particle size of powder is below 0.65438±0mm, the prototype precision after molding can reach 65438 0%. (4) high material utilization rate, low price and low cost; (5) The warping deformation is smaller than that of SLA process, so two pieces with fine and strip structure can be designed and manufactured. (6) Difficulties 1: The surface of the parts is rough and the particles are large, so it is necessary to polish the surface manually. (7) Difficulty 2: Keep the temperature of the powder in the container just below the melting point by melting. Sodium dodecyl sulfate is called sodium dodecyl sulfonate in Chinese (sodium-sodium; Lauryl dodecylamine is also called lauryl; Sulfate-sulfate SLS hemoglobin detection method The main component of SLS hemoglobin detection method is sodium dodecyl sulfonate (SLS). The chemical reaction steps of hemoglobin detection are as follows: 1. Surfactants first dissolve red blood cells and release hemoglobin molecules. 2. Positive divalent iron ions in hemoglobin molecules are oxidized to positive trivalent iron ions, and the hydrophilic end of SLS combines with positive trivalent iron ions to form a stable SLS-Hb colored group. SLS-Hb has the maximum absorption peak at 535nm. This method does not contain cyanide and is non-toxic and environmentally friendly. SLS is a fat-soluble reagent, which can greatly weaken the influence of turbidity caused by hyperlipidemia and high white blood cell count on hemoglobin detection.