The slurry is the same as the ore slurry of Yunxi Company, and its ratio is: 3 liters of water, 1. For composite materials with high particle volume fraction, because the particle volume fraction Small three-way valve is too high, there is less matrix between the particles, and there is even direct contact between the particles. This transition zone is staggered and uneven. Particle volume fraction (%) relative wear resistance of high chromium cast iron.1 Erosion wear test method The erosion wear test is carried out on the self-developed erosion wear tester. When the particle volume fraction is 36, the composite material has good erosion resistance. Under the interaction of the 'shadow effect' and 'supporting effect', the volume loss of the composite material is greatly reduced, and the overall erosion resistance is improved. The particle volume fraction directly affects the synergy of 'shadow effect' and 'support effect'. This ensures the support of the matrix to the particles in the composite layer, and makes the particles in the erosion and abrasion process It is not easy to fall off, thereby improving the wear resistance of the entire composite material. Furthermore, the contact area between the fine particles and the substrate is small, and the nail hole depth is shallow. In order to obtain a high-chromium cast iron matrix with a surface composite layer, a method of adding high-carbon ferrochromium particles to tungsten carbide particles is adopted. The melting point of high-carbon ferrochromium is not high, and it has good wettability with molten cast iron. The particle volume fraction is adjusted by adjusting the weight ratio of high carbon ferrochrome alloy to WC particles. The measurement of the microhardness of the composite material with volume fraction of 27 is shown in Table 2.Under the action of pressure and capillary force, the molten iron penetrates into the micropores of the particles. It is easy to loosen and fall off under the repeated impact and cutting of the abrasive particles, causing the substrate to be exposed to the medium and suffer serious erosion and wear. During solidification, the dispersed and finely distributed WC grains () are precipitated, which form a metallurgical bond with the matrix and have a high bonding strength. The thickness of the transition zone is about 0. Controlled at about 35, the wear test results are shown in Table 3. This is mainly because: when the particle size is larger (20-30 mesh), the particle gap is larger than the size of abrasive quartz sand at the same volume fraction.