新型复合碳铵防结块剂的研制

本文介绍了一种自行研制的新型复合碳铵防结块剂。该产品能增大碳酸氢铵结晶粒度 ,且具有良好防结块性能 ,稳定性好 。

保氮复合碳铵的肥效及增产机理研究

本研究研制出一种保氮复合碳铵 ,它与碳铵相比能提高氮肥利用率 5 2 %～ 1 5 % ;减少氨挥发损失 5 %～ 1 2 % ,使水稻增产 5 %～ 1 0 % ,棉花增产 6%～ 2 0 %。而且具有不结块、氨臭味减少、生产成本降低、施用方便、实用性广等特点。经 1 3.3hm2 大田示范 ,均获良好增产效果。

新型稀土碳铵复合肥的制备及应用

提出利用自制的新型稀土添加剂制备稀土碳铵复合肥 ,并重点研制了以碳铵作氮源复合肥的稳定性 ,通过肥效试验 。

Effects of addition of NH_4HCO_3 on pore characteristics and compressive properties of porous Ti-10%Mg composites

Porous Ti-Mg composites were successfully fabricated through powder metallurgy processing with ammonium hydrogen carbonate （NH4HCO3） as a space-holder. The effects of NH4HCO3 on properties of porous composites were comprehensively investigated. The pore characteristics and compressive properties of the specimens were characterized by X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. The results show that the porosity of the porous composites can be tailored effectively by changing the amount of NH4HCO3 added, and the use of NI-I4HCO3 has no influence on the microstructure and phase constituents of the Ti-10%Mg porous composites. The open porosity and compressive strength as well as compressive elastic modulus vary with the adding amount and particle size of NHaHCO3. When the mass fraction of NHaHCO3 added is 25%, elastic modulus and compressive strength of composites with porosity of around 50% are found to be similar to those of human bone.