Chemical Reaction between Titanate Compounds and Phenolic Resins

Emiko Daimon; Kosuke Inada; Yoshinori Yamamoto; John O'Doherty

doi:10.4271/2011-01-2366

Titanate compounds are well-known for being widely used in Non-Asbestos Organic (NAO) brake pad formulations. These NAO formulations provide excellent performance in friction stability and a low amount of wear for disc brake pads.

In our previous reports, we observed that brake performance in dynamo testing is influenced by a titanate's chemical composition, crystalline structure, and powder properties. We also introduced the thrust test machine as an easy method to evaluate friction materials [1], [2].

In our later research, Otsuka synthesized a new non-fibrous titanate that performs nearly at the same level as fibrous titanates. This new non-fibrous compound contains many pores which form as a result of aggregates of submicron-sized particles; this thereby provides strong fade-proof performance [3].

Our newest study finds that under high temperatures and in the presence of small amounts of oxygen (i.e. when friction is produced) the chemical properties of Otsuka's titanates induce a chemical reaction with the cross-linked phenolic resin. This resin is the pad's binder resin. This study evaluates the chemical reactivity of these titanate compounds and the cross-linked phenolic resin, and finds that titanates have a higher reactive efficiency than other materials.

Our theory is that the reaction that occurs on the friction surface between the titanate and the phenolic resin may influence the tribological performance of the brakes.

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Chemical Reaction between Titanate Compounds and Phenolic Resins 2011-01-2366

SAE MOBILUS