Due to burning at different temperatures, bismuth oxide can produce three variants: α-body: yellow heavy powdery or monoclinic crystal, melting point 820℃, relative density 8.9, refractive index 1.91. It changes toγat 860℃-body. β-body: gray-black cubic crystal with a relative density of 8.20, which turns into α-body at 704℃. γ-body: heavy pale lemon yellow powder, which belongs to the tetragonal crystal system, melting point is 860℃, relative density is 8.55, it becomes yellowish brown when melting, it is still yellow after cooling, it melts under strong red heat, and it crystallizes after cooling Lumps. All three are insoluble in water, soluble in ethanol and strong acid. Preparation method: Burn bismuth carbonate or basic bismuth nitrate until constant weight. Keep the temperature at 704℃ to get α, β-body, and keep at 820 ℃ or more to get γ-body. Its use: as a high-purity analytical reagent for inorganic synthesis, red glass ingredients, pottery pigments, medicine and fireproof paper.
Preparation of bismuth oxide
A method for producing high-purity bismuth oxide from bismuth-containing materials. First, the bismuth-containing material is subjected to a leaching reaction with a hydrochloric acid solution, so that the bismuth in the bismuth-containing material enters the solution in the form of bismuth chloride, and the leaching solution and the leaching residue are separated ; Then, pure water is added to the leaching solution, bismuth chloride undergoes a hydrolysis reaction to precipitate bismuth oxychloride; then, the precipitated bismuth oxychloride is separated, and a dilute alkaline solution is added, the bismuth oxychloride is converted into under the condition of low temperature dilute alkali Bismuth oxide; then add concentrated alkali solution to the filtered bismuth and convert it into bismuth oxide after high temperature concentrated alkali; finally, the generated bismuth oxide can be washed, dried and sieved to obtain the high-purity bismuth oxide. The invention uses bismuth-containing materials as raw materials to make bismuth enter the solution in the form of bismuth chloride, and then it into bismuth oxychloride, and then converts it into low-temperature dilute alkali conversion and high-temperature concentrated alkali conversion to produce bismuth oxide. The method has a simple process, less reagent consumption, and can deeply purify and separate impurities such as Fe, Pb, Sb, and As.
A bismuth oxide coated ceramic phase reinforced aluminum matrix composite material, which relates to a new type of composite material. The aluminum-based composite material of the present invention is composed of bismuth oxide, ceramic phase reinforcement and aluminum matrix. The volume fraction of the ceramic phase reinforcement occupies 5~50% of the total integral number, and the added amount of bismuth oxide accounts for the ceramic phase reinforcement 2~20% of body mass.
The coating bismuth oxide is basically at the interface between the reinforcement and the substrate, and the bismuth oxide and the aluminum of the substrate undergo a thermite reaction, and the low-melting-point metal bismuth is distributed at the interface between the reinforcement and the substrate. When the composite material is thermally deformed, the temperature is higher than the melting point of bismuth metal 270 ℃, the low melting point metal bismuth at the interface melts into a liquid, which acts as a lubrication between the reinforcement and the substrate, reducing the deformation temperature and processing cost, reducing In view of the damage of the ceramic phase reinforcement, the deformed composite material still has excellent mechanical properties.
Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional bismuth oxide manufacturer with over 12 years experience in chemical products research and development. If you are looking for high quality bismuth oxide, please feel free to contact us and send an inquiry.
