3results about How to "Good magnetic stability" patented technology

The invention provides a preparation process of a magnetic powder core with high magnetic conductivity and low loss, and belongs to the technical field of magnetic powder core preparation. The preparation process comprises the following steps: synthesizing the TiO2 coated Al2O3 nanowire; preparing an insulating coating; performing insulation coating on the powder; and preparing the magnetic powder core. Alloy powder is subjected to phytic acid coating firstly and then subjected to ammonium molybdate annealing to be converted into MoO3 coating, phytic acid surface treatment is carried out firstly, phytic acid molecules can react with active sites on the surface of the alloy powder to form an initial insulating layer, and when MoO3 insulating coating is carried out subsequently, the surface of the alloy powder is coated with the MoO3, so that the surface of the alloy powder is coated with the MoO3. MoO3 can be further coated on the basis of an existing phytic acid insulating layer, a double-layer protection structure is constructed, the eddy current loss of the magnetic powder core in an alternating magnetic field can be reduced through phytic acid and MoO3 double-layer insulating coating, and the magnetoelectric performance of the magnetic powder core is improved.

This invention relates to a method for identifying the magnetic properties of a mixture of tungsten carbide powder and cobalt powder. The method includes the following steps: (1) sampling the mixture of tungsten carbide powder and cobalt powder and sealing and storing the sample; (2) preparing the sealed sample into an identification compact, storing the compact in a fixed environment until the expiration date, then placing it in a graphite boat and sintering it together with a large batch of products; (3) testing the magnetic properties of the sintered identification compact. The identification method simulates the actual production cycle to the greatest extent possible. The graphite boat isolates the sample from atmospheric influences without causing carbon buildup, and the identification results can reliably guide large-scale production.

The invention provides cosmetic highlight pearlescent magnetic powder as well as a preparation method and application thereof. The magnetic powder is prepared from magnetic metal oxide, mica powder, titanium dioxide, a siloxane surface treating agent, pearlescent pigment, an adhesive, an antioxidant and an active agent. The magnetic metal oxide comprises ferroferric oxide, ferric oxide, zinc oxide and the like, and the particle size of the mica powder is 10-50 microns. The siloxane surface treating agent comprises polydimethylsiloxane and the like, and the adhesive is polyvinyl alcohol and the like. The antioxidant comprises butylated hydroxyanisole and the like, and the active agent is a mixture of cocamidopropyl betaine and lecithin. The preparation method comprises the steps of surface modification of the magnetic metal oxide, preparation of pearlescent pigment suspension, doping treatment, mixing and ball milling. The high-gloss pearlescent magnetic powder with uniform particle size is prepared through ultrasonic stirring and magnetic field treatment, has good dispersity and adsorbability, and can effectively adsorb skin grease and improve the oil control effect of cosmetics.