50results about How to "High temperature corrosion resistance" patented technology

The present invention aims to produce a cold rolled metal coated multi-phase steel, characterized by a tensile strength of at least 500 MPa, a yield ratio (Re / Rm) lower than 0.65 in skinned conditions, lower than 0.60 in unskinned conditions, and with good metal coating adhesion behavior. In the case of the aluminized steel according to the invention, the steel also has superior resistance to temperature corrosion up to 900° C. and excellent mechanical properties at this high temperature. The hot metal coated steel product having a steel composition with a manganese content lower than 1.5%, chrome content between 0.2 and 0.5%, molybdenum content between 0.1 and 0.25%, and a relation between the chrome and molybdenum content as follows Cr+2 Mo higher than or equal to 0.7%, undergoes a thermal treatment in the hot dip metal coating line defined by a soaking temperature between Ac1 and Ac3, a primary cooling speed higher than 25° C. / sec and a secondary cooling speed higher than 4° C. / sec.

The present invention discloses an electrode materials of composite rare-earth iridium alloy that is a noble metal alloy containing Ir. The noble metal alloy contains 99.5-99.9 wt% Ir and 0.10-0.50 wt% X; the X is one or a mixture of some of the La, Nd, Pr, Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ce; the noble metal alloy can also contains Th and Al added at the same time. The invention also discloses a sparking plug of composite rare-earth iridium alloy, includes a center electrode and at least a lateral electrode, ignition tip of the center electrode and / or the lateral electrode is the noble metal alloy. The invention provided electrode materials has advantage of high-temperature resistance, strong high-temperature corrosion resistance and excellent performance price ratio; sparking plug of using the electrode materials can provide strong spark on time even the motor is in high-speed, high-temperature high-pressure condition.

The invention provides a method for preparing a titanium sponge through a resistance furnace by using a molten salt electrolysis method. The method comprises the following steps of: processing a calcium chloride fused salt (14) in a graphite crucible (2) in a low and constant temperature water extracting manner; charging argon into a sealed vacuum reactor through an air inlet pipe (6) after the water is removed; heating the resistance furnace (1) at a constant speed until reaching 1,000 DEG C; automatically lowering two electrode stems (9) through a lifting rod (8) in order to drive titanium dioxide (3) and a graphite plate (12) to enter the graphite crucible, wherein all current is 50A; exhausting carbon monoxide and carbon dioxide generated in electrolysis and the rest argon into a waste gas recycling tank through an air outlet pipe (10); lifting out the sealed vacuum reactor after electrolyzing to prepare the titanium sponge; pouring cooling water into an annular circulating water jacket (4) and an inner water jacket (5) until reaching room temperature; opening a reversed U shaped upper cover (11); taking out electrolyzed titanium dioxide; and then cleaning to obtain the titanium sponge with the purity up to 99.0%. The method has the characteristics of mature performance, safety and energy conservation performance.

The invention relates to a coating for a furnace wall on the internal side of the furnace body of a polycrystalline silicon reduction furnace (a lining coating for short) and a production method of the coating, in particular to a lining anticorrosive infrared reflection coating of an improved-Siemens-process polycrystalline silicon reduction furnace. The coating is made of a metal-ceramic material. The coating is directly coated on the furnace wall on the internal side of the furnace body of the improved-Siemens-process polycrystalline silicon reduction furnace. The adopted coating method is a physical vapor deposition method or a chemical vapor deposition method. The thickness of the lining coating of the polycrystalline silicon reduction furnace is 1-10 micrometers, the production cost is low and the adhesive force of the coating on the furnace wall is strong. The coating can resist high temperature, strong acid and alkali corrosion and mechanical impact and scraping, the infrared reflection efficiency is high, the service life is long and the loss of heat in the improved-Siemens-process polycrystalline silicon reduction furnace because of heat transfer towards the outside of the furnace can be effectively reduced. Since the coating replaces a pure-gold infrared reflection coating, the expense of the coating material is greatly decreased and the cost of producing polycrystalline silicon products by adopting an improved Siemens process can be greatly decreased.