Metal hydrides are compounds composed of certain metal elements (alkali metal elements, alkali earth metal elements other than beryllium (Be), some d-zone elements, and some f-zone elements) and hydrogen elements. This type of compound has active chemical properties and low reserves, but has high practical value. Common metal hydrides include sodium hydride, potassium hydride, calcium hydride, cuprous hydride, lithium aluminum hydride, and lithium hydride. The overall definition of hydrides can be divided into three categories: ionic hydrides, molecular hydrides, and metal hydrides. Metal hydrides belong to two categories: ionic hydrides and metal hydrides. Ionic metal hydrides: When hydrogen gas directly combines with alkali metals and most alkaline earth metals at higher temperatures, the hydrogen atom obtains an electron, becoming an H-ion, generating ionic metal hydrides. Common ionic metal hydrides include LiH, NaH, KH, CaH2, BaH2, etc. Ionic metal hydrides need to be generated at higher temperatures because the reaction H2====H- Δ RH> 0 needs to absorb heat. And the corresponding reaction of halogen element X2====X- Δ RH< 0 is an exothermic reaction, so ionic hydrides are not as common as corresponding halides. Ionic metal hydrides are all white or grayish white crystals, with LiH and BaH2 having high thermal stability and melting without decomposition at 688.7 ℃ and 1200 ℃, respectively. Other ionic metal hydrides decompose into corresponding elemental substances before melting. Ionic metal hydrides in the molten state conduct electricity. They have many properties similar to salts, so they are sometimes referred to as salt type hydrides
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China