China's current wear-resistant materials commonly used in the following major series:

First, high manganese steel series: such as high manganese steel (ZGMn13),

High manganese alloy (ZGMn13Cr2MoRe), ultra-high manganese alloy (ZGMn18Cr2MoRe) and so on;

Second, anti-wear chromium cast iron series: such as high, medium and low chromium alloy cast iron (such as Cr15MOZCu);

Third, wear-resistant alloy steel series: such as medium, low, high-carbon multi-gold alloy (such as ZG40SiMnCrMO and ZG35Cr2MoNiRe);

Four is the Austrian ball ductile iron (ADI) series;

Five are all kinds of composite or gradient materials and cemented carbide materials: such as chromium carbide composite (Cr2C3 + Q235), high energy ion implantation of tungsten carbide material (WCSP), high tough cement (YK25.6); (Y2O3 + ZrO2), toughened alumina (Al2O3 / ZrO2), etc. Different series of wear-resistant materials, such as polymerized ceramic composites, silicon nitride (Si3N4), toughened zirconia Material performance comparison:

2.2.1 High manganese steel series: its representative for the high manganese steel ZGMn13. Under severe impact or contact stress, the surface will quickly harden, while the core remains strong toughness, external hard internal toughness both anti-wear But also the impact of the surface and the heavier the impact, the surface hardening the more fully, the better the wear resistance due to high hardness of high manganese steel itself is very low (HB170-230), in the non-hardened wear resistance is extremely limited, If the surface of the high manganese steel bear the impact of insufficient, the surface can not be fully hardened (fully hardened after the surface hardness of up to HB550 above, and vice versa in the HB350) wear resistance can not play, and showing no wear conditions.

2.2.2 anti-wear high-chromium cast iron series: According to the structure and use of the structure, chrome-based cast iron can be divided into three categories: the first category is a good high-temperature performance of the chrome-white cast iron. For the 33%, the majority of its organization for the austenite and iron chromium carbide, and sometimes ferrites .This alloy in addition to a certain wear resistance, the temperature is not higher than 1050 ℃ under high temperature conditions, with Good oxidation resistance. The second category is a good wear resistance of the chrome-type white cast iron (referred to as high-chromium cast iron.) This cast iron contains 12 to 20% of the chromium, but also contains the right amount of molybdenum. (Fe, Cr) 7C3 type carbide and γ phase.When the matrix is all martensite, the alloy wear resistance is the best.If the matrix exists in the retained austenite, usually to be carried out Heat treatment. The third category is low chromium alloy white cast iron. Compared with ordinary white cast iron, this cast iron in the stability of the carbide better. [2]

2.2.3 Wear-resistant alloy steel series: It is divided into low-alloy steel, medium and high alloy steel. Wear-resistant alloy steel can control the chemical composition and heat treatment process to obtain the necessary material impact toughness and hardness index. Up to HRC = 52 ~ 58, toughness can reach ak = 15 ~ 30J / cm2.

2.2.4 Austrian ball ductile iron (ADI) series: it is through the isothermal quenching heat treatment or alloying elements, the ductile iron matrix structure from ferrite, pearlite into the Austrian body, bainite and residual Aoki ADI has the following unique advantages: ① h

igh strength, good plasticity.② bending fatigue and contact fatigue and other dynamic load performance.ADI rotation bending fatigue strength up to 400 ~ 500MPa, and quenched and tempered low alloy steel, ADI contact fatigue strength of up to 1600 ~ 2100MPa, than the low alloy steel nitriding treatment and carburizing treatment of contact fatigue strength. ③ good shock absorption .ADI due to low modulus of elasticity, coupled with the presence of graphite ball in the matrix, Absorb vibration and increase the noise damping, so that the operation of the components more quiet and smooth. ④ excellent wear resistance, abrasion resistance .ADI wear resistance, than any of the same hardness level of steel are good. ⑤ processing performance: ADI most of the mechanical processing can be completed before the isothermal quenching, this time generally ferritic ductile iron, the processing performance is significantly better than steel.

2.2.5 composite or gradient material series: its representative is high energy ion implantation of tungsten carbide material (WCSP) and chromium carbide composite material (Cr2C3 + Q235). Carbide tungsten carbide material (WCSP) is the use of high energy ion implantation Technology to the surface of steel parts injection of tungsten carbide (WC) .WC and steel matrix both metallurgical combination, complementary advantages. Surface with WC high hardness, high wear resistance. The heart is retained the original steel matrix Hardness and toughness between the surface and the heart there is a gradient gradient of the performance gradient, effectively avoiding the performance of mutations may cause material damage. [3]

Hammers with carbide: Compared with high manganese steel and high chromium alloy steel, hammers with hard alloy with higher hardness and wear resistance.

YK26.5: density: 14.58 (g / cm3); hardness (CHRA): 87.5; bending strength: 2650 (MPa); fracture toughness: 12-16 (MPam1 / 2)

2.2.6 non-metallic wear-resistant materials series

(SiC), silicon nitride (Si3N4), toughened zirconia (Y2O3 + ZrO2), toughened aluminum oxide (Al2O3 / ZrO2), and other materials, such as ceramic composites, silicon carbide (SiC) Wait.

Ceramic composite material: ceramic is a metal and non-metallic elements of the crystal or amorphous compounds, high melting point, high hardness, strong stiffness, good chemical stability. Wear-resistant ceramic coating is a non-metallic cement material, it is used Acid and alkali resistant synthetic powdery ceramic materials.

Features:

(1) high mechanical strength and stiffness: density, strength up to 130Mpa, can effectively resist the impact of materials and shear stress.

(2) excellent toughness and shock resistance: As the ceramic abrasive without directional rigid fiber and directional mesh enhancement measures, through the coupling to further improve the toughness, so the fracture toughness, which can effectively prevent the impact caused by damage and peeling.

(3) good environmental compatibility. [4]

jaw plate

(Y2O3 + ZrO2), toughened alumina (Al2O3 / ZrO2) and other structural ceramics. With wear resistance, corrosion resistance, high temperature, high strength, high hardness Etc.

Can adapt to the metal and polymer materials can not afford the environment and working conditions. Specific indicators are as follows:

Material Reinforced Zirconia Reinforced Aluminum Trioxide

Composition Y2O3 + ZrO2 Al2O3 / ZrO2 Si3N4

Density g / cm3 6-6.05 3 - 4.5 3.2

Hardness CHRA 89 85 - 88 93

Bending strength MPa1000-1200 300-500 900

Fracture toughness MPam1 / 212-14 5-7 8.5