39results about How to "Avoid cracking tendencies" patented technology

The invention relates to a novel nickel-free grate material for a sintering machine, which mainly solves the technical problems of insufficient oxidation resistance and low service life of the existing grate. The material comprises the following chemical components in percentage by weight: 1.20 to 2.00 percent of C, 1.5 to 2.5 percent of Si, 1.5 to 2.5 percent of Mn, less than 0.06 percent of S, less than 0.06 percent of P, 11 to 20 percent of Cr, 0.3 to 0.8 percent of Mo, 0.02 to 0.03 percent of Nb, 0.02 to 0.03 percent of Ti, 0.05 to 0.2 percent of modificator and the balance of iron. A novel multi-element high-temperature resistant alloy with good high-temperature oxidation resistance and abrasion resistance can be obtained through the design of reasonable components and the multi-element alloying treatment. The service life of the grate material for the sintering machine is greatly prolonged, the using cost is reduced, the labor intensity is reduced, the operability of a sinteringtrolley is improved, and the quality stability of sintered ore is also improved.

The invention discloses an oil removal and heavy metal removal modified walnut shell filter material and a preparation method thereof; the surface of the oil removal and heavy metal removal modified walnut shell filter material is provided with an oxidized graphene coating. The preparation method of the filter material includes the steps that walnut shell powder and oxidized graphene powder are added into a V-shaped mixer simultaneously to be stirred and mixed uniformly, then a cross-linking agent and deionized water are added, cross linking is conducted at the temperature of 50-80 DEG C for 3-3.5 hours, after the liquid phase is filtered out, absolute ethyl alcohol is washed to be neutral, drying is conducted for 1-3 hours at the temperature of 100-140 DEG C, finally a vibration screen is utilized to screen out the filter material with the particle size meeting the requirement, and a finished product is obtained. By means of the filter material, grease and heavy metal in sewage water can be removed simultaneously, the sewage treatment process is greatly simplified, sewage treatment cost is lowered, sewage treatment efficiency is high, the filter material is high in hardness, resistant to wear, good in pressing resistance, not prone to caking, large in toughness, easy to regenerate, long in replacement cycle and low in cost.

The invention relates to a heat-resistant sphere which is prepared from the following components in percentage by weight: 3.00-4.20% of C, 1.8-3.0% of Si, 0.2-1.2 of Mn, 2.0-4.0% of Ni, 0.3-1.0% of Mo, less than or equal to 0.07% of P, less than or equal to 0.02% of S and the balance of Fe. According to the heat-resistant sphere provided by the invention, the fatigue resistance of the material is guaranteed by adding Ni and Mo elements; and moreover, the cold cracking tendency is reduced, the safety coefficient is improved, and the service life is prolonged. The preparation process is further improved, for example, the content of S is strictly controlled, and S is removed in a ladle by using industrial sodium carbonate; a metal-stream inoculation treatment method is adopted; a unique high-medium annealing treatment process and the like are adopted, and the tensile strength, yield strength, ductility and hardness HS of the prepared heat-resistant sphere are greatly improved.

The invention provides soldering flux applicable to quick restoration of cold-punching dies and inserts and a preparation process of the soldering flux. The soldering flux comprises, by weight, 15-20% of aluminum, 1-5% of chromium, 1-5% of manganese, 1-3% of iron and the balance of copper and inevitable impurity. The preparation process of the soldering flux includes steps of continuously casting blank metal bar in the diameter of 3-6 mm in a horizontal or vertical continuous casting manner, and grinding and polishing the blank metal bar so as to be directly used as soldering flux for quickly restoring the cold-punching dies and the inserts. The soldering flux used for quickly restoring the cold-punching dies and the inserts has the advantages of short restoration time, less post-welding defects, good mobility during welding, less deformation and cracking and capability of preventing scratch or drag damage and the like. The cold-punching dies and the inserts after restoration can be further used more than 30,000 times.

The invention discloses a method for electrodepositing a nanocrystalline functional coating on the surface of a porous metal substrate based on anodic oxidation. 2+ -Sn 2+ Sensitization activation, Ni-P electroless plating and pulse electrodeposition nanocrystalline functional coating. The method of the present invention utilizes the electroless Ni-P film as a transition layer, which is beneficial to subsequent electrodeposition of multiple coatings, such as Ni, Cu, and the amorphous structure helps to refine the grain size of the subsequent coating; The aging treatment at low temperature in the method is beneficial to alleviate the growth stress of the Ni-P film and avoids the tendency of cracking; the method of the present invention is applicable to the surface modification of various active metals such as pure titanium, aluminum or magnesium; The Ni‑P thin film is used as a transition layer to electrodeposit a large thickness of nanocrystalline coating. The method of scratch test and cross-section observation is used to verify that the interface bonding force is good, and it can be used as an engineering surface material under general low-load and anti-wear conditions.