Brèf analiz de materyèl devlope ansanm ak materyèl friksyon
At the same time as the development of organic friction materials, another type of friction material that is more commonly used is powder metallurgy friction materials. Before 1929, the Soviet Union's Schwarzkopf applied for the first patent for a sintered material for friction. The material was an alloy containing a small amount of lead, tin and copper. The United States also started the research of this work in 1929. In the late 1930s, the material was first used on the clutch plates of D-7 and D-8 scrapers. The American General Company organized the production of sintered materials for clutch plates in 1932, which was adopted by the aviation industry at that time.
Prensip la plis matirite debaz pwosesis nan jaden an nan materyèl friksyon metaliji poud se incorporée nan patant yo jwenn pa Willman ak kòlèg li yo nan Etazini yo ant 1937-1941. Patant sa a sèvi ak fèblan an kwiv kòm matris metal la nan materyèl la friksyon, ak fèblan an kwiv ka alyaj ak zenk. Yo ajoute fè ak silica pou ogmante koyefisyan friksyon, epi yo ajoute grafit ak plon kòm konpozan lubrifyan.
Apeprè yon peryòd de tan ant 1950 -1980, materyèl friksyon poud metaliji yo te itilize avèk siksè nan friksyon sèk ak friksyon mouye espas travay. Zòn aplikasyon li yo elaji nan fren ak anbreyaj pou machin mwayen ak lou, machin agrikòl, elatriye. Depi 1958, konpayi Britanik Frood la te kolabore ak konpayi Ameriken SK Wellman ak Bendix Aviation pou pwodwi an kwiv -ki baze, fè{ {4}}materyèl friksyon ki baze sou ak seramik.